Determining the Concentration of Sulphuric Acid Essay Example for Free

Determining the Concentration of Sulphuric Acid Essay I am going to plan an experiment to determine the accurate concentration of sulphuric acid. It is thought to have the concentration between 0.05 and 0.15 moldm-3. I will be provided with a solid base which is anhydrous (powder) sodium carbonate (Na2CO3). To find the accurate concentration I will titrate the sulphuric acid against the sodium carbonate. The reaction following will take place: Na2CO3 (aq) + H2SO4 (aq) Na 2 SO4 (aq) + CO2 (g) + H2O(l)1 Deciding the Amounts Sulphuric acid has a concentration about 0. 10 moldm-3 (half way between 0.05 and 0.15 moldm-3). I would like to use 25cm3 of sulphuric acid. This is because, it is not a wasteful amount and also it would reduce percentage errors because this is quite a large amount to use. It would be an ideal value to use. Furthermore, I will need to make up a standard solution from the solid base that I have been provided with, which is sodium carbonate. I would again ideally like to use 25cm3 of the standard solution per titre. This is because, the pipettes have the reading of 25cm3, which means the pipette is readily, available for this amount, therefore it is a sensible value. Consequently I will need to make up a standard solution of concentration 0.10moldm-3. This is because of the stoichiometry. The equation shows that for every one mole of sulphuric acid, there is one mole of sodium carbonate. Therefore, the concentration must be the same because the volumes are the same and the number of moles are the same. I estimated the concentration of sulphuric acid to be 0.10 moldm-3 because its halfway between the thought amount of 0.05 and 0.15 moldm-3, therefore the concentration of the standard solution must be the same. Deciding what Indicator to Use I need to use an indicator to see when the end point of the titration occurs, and they are used between acid and alkalis. I have decided on using 2-3 drops of methyl orange indicator fin my experiment per titre. This is because; methyl orange indicator gives an accurate indication of the end point using a strong acid (sulphuric acid) and a weak alkali (sodium carbonate). 2 Making up my Standard Solution As I have mentioned before, I want my standard solution to have the concentration of 0.10 moldm-3. I have chosen my volumetric flask to be 250cm3. This is because these volumetric flasks are readily available. In addition, I am aiming to do approximately five titrations, therefore this amount would allow me to do five titrations and have some to spare. I now need to find out how much sodium carbonate (Na2CO3) is needed to make a standard solution of concentration 0.10 moldm-3. I need to use the equation: Number of moles = concentration (moldm-3) x volume(dm3)3 n = c x v The volume is 250cm3 so I need to divide this by 1000 so that it converts into dm3. Number of moles = 0.10(moldm-3) x 0.25 (dm3) Number of moles = 0.025 moles Therefore, 0.025 moles id required for the standard solution, nevertheless, I now need to convert this into grams by using the equation: Number of moles = Mass (g) / Molar mass(gmol-1)4 Mass (g) = Number of moles x Molar mass(gmol-1) Molar mass for Na2CO3 = (23 x 2) + 12 + (16 x 3) = 106gmol-1 Mass (g) = 0.025 x 106 = 2.65g Therefore, 2.650g of sodium carbonate is required for my standard solution. My experiment The apparatus I am going to use are as follows: * Burette * Conical flask * Volumetric flask * Rubber ball pipette filler * Distilled water * Beakers * Filter funnel * Teat pipette * Tile * Sulphuric acid * Sodium Carbonate * Scales * Spatula * Weighing bottle * Glass rod * Stand * Clamp * Methyl orange indicator Plan of Experiment 1. Prepare apparatus. 2. Weigh a weighing bottle accurately. Using a spatula, transfer 2.650g of sodium carbonate to the weighing bottle and weigh again. 3. Tip the contents of the weighing bottle into a clean 250cm3 beaker and reweigh the empty weighing bottle to find the weight by difference. This way I can work out the actual weight of sodium carbonate that has been transferred. 4. Add 50cm3 of distilled water to the solid and stir using a glass rod until dissolved. Transfer this solution into a volumetric flask using a funnel. Make up the graduation mark with distilled water using a teat pipette to ensure you so not overshoot it. This is now the standard solution. 5. Put a stopper on the flask and invert it about 20 times to make sure all the solution is mixed. 6. Using pipette filler, pipette 25.0cm3 of the solution into a clean conical flask. 7. Clean the burette out with distilled water and then again with sulphuric acid. Attach the burette to the stand, and fill the burette using a funnel with sulphuric acid. 8. Add methyl orange indicator to the conical flash only about 2-3 drops. Put the conical flask onto a white tile so the colour change is easy to see when titrating. 9. Titrate the solution until you reach the end point (when the solution turns orange), and record your results. I am going to use this as a rough titre. 10. Repeat this to obtain concordant results, concordant meaning results that are similar usually results which are in 0.1cm3 of each other. Risk Assessment Chemical Name Form Used Safety Statement Precautions Sulphuric Acid 0.05-0.15 moldm-3 Irritant Wear eye protection and gloves. Wear a lab coat. If spilt on skin dry with a cloth and then wash with water. If spilt dry with cloth and then scrub using water. If it gets it contact with eyes wash them with water thoroughly. 6 Sodium Carbonate Solid and at 0.10 moldm-3 Irritant, but if dust gets in eyes its harmful. Wear safety goggles, gloves and also protective clothing. If in contact with eyes wash quickly with clean water. If spilt on skin wash intensely. If inhaled move to an area of fresh air. If spilt anywhere scoop as much as possible up. 5 Methyl Orange Indicator 2-3 drops Irritant Wear safety goggles, gloves and also protective clothing. If spilt, clean it up using a cloth and water. If gets in contact with skin wash the area thoroughly. If enters eyes wash with clean water. 6 Why my plan will Devise Reliable results My plan will devise reliable result because of many reasons. Firstly I am going to do a rough titre in my plan, which means I will have a rough idea of my titration, so when I do my real results I know when to add it drop wise, so that I wont overshoot the end point. Another reason why I wont overshoot the end point is because I am going to use a white tile so I can judge the end point more accurately. Furthermore, I am only going to add 2 or 3 drops of methyl orange indicator. This will make my results more reliable because the methyl orange indicator is slightly acidic, so it would use up the alkaline solution, therefore by only adding a small amount of it will make my results more reliable and accurate. In addition, I am also going to wash my equipment out thoroughly with distilled water and then with the solution I am going to put that piece of equipment. This will remove any impurities that were originally in the containers so will make my results more reliable. Also, when I am measuring the solution, I will measure accurately by using a pipette to make sure the bottom of the meniscus is on the line to make my results more accurate. Also, when reading the burette I will put a piece of plain paper behind so I can read it more accurately. I will also, remember to take the funnel out of my burette as this could also affect the accuracy of my results. This is because drops are still on the funnel could enter my burette which mean more sulphuric acid affecting my results. This way by removing the funnel, I will achieve accurate results. 7 Finally, I am going to use accurate equipment as possible, which will minimise errors in my results. Overall my results will be very accurate and reliable! References 1. Article on types of chemical reactions, http://www.sky-web.net/science/reaction-types. I used this to help me write my balanced equation for the reaction between sodium carbonate and sulphuric acid. 2. Information on the use of indicators in acid-alkali titrations, salters practical assessment. I used this to decide what indicator to use as it told me what to use if I had a strong acid and weak alkali. 3. Chemical ideas, 2nd edition, chapter 1, section 1.5, concentrations of solutions, published by Heinemann 2000. I used this to get the concentration equation. 4. Power point presentation on moles and concentration, http://moodle.kedst.ac.uk/mod/resource/view.php?id=4556. This helped me find the formulas for concentration and to find out the mass. 5. Safety data sheet, http://www.brunnermond.com/products/sodium_carb. I used this source to find out the safety statement of sodium carbonate and the precautions I will need to take. 6. Hazard cards, numbers 98 and 32, Cleapps 1998 and 2003. I used these to find out the safety statement and also the precaution I will need to take when doing my experiment for methyl orange indicator and sulphuric acid. 7. Skills for Salters as Chemistry, pages 3,4,6,7 and 29, chemistry department, 2007. I used this to see how I will use my equipment and use it accurately, giving me accurate results. Analysis I made up my standard solution by firstly weighing out some sodium carbonate. I weighed the weighing bottle and added approximately 2.65g of sodium carbonate. I then transferred the sodium carbonate to a beaker and reweighed the weighing bottle, so I can therefore work out exactly how much sodium carbonate I transferred. Mass of weighing bottle and sodium carbonate = 57.732g Mass of weighing bottle after transfer of sodium carbonate = 55.052g Consequently the accurate amount of sodium carbonate transferred is the mass of the weighing bottle and the sodium carbonate, minus the mass of the weighing bottle after the transfer which is: 57.932g 55.052g = 2.680g Therefore, 2.680g of sodium carbonate was transferred. Next I added about 50cm3 of water to the beaker and using a glass rod I stirred the solution until the sodium carbonate has dissolved. This was then fully transferred to a volumetric flask and water was added to the 250cm3 graduation mark. I then used a pipette to transfer 25.00cm3 of this standard solution to a conical flask and titrated with the unknown acid. I used 25.00cm3 of the standard solution for each titre after the experiment; I had obtained results for how much acid was added for each titre. The results for how much acid I added for each titre are as follows: 20.10cm3, 19.85cm3 and 20.05cm3. I am now going to work out an average by picking out the concordant results (results which are in 0.10cm3 of each other) and dividing by how many there is. 20.10cm3+ 20.05cm3/2 = 20.075cm3. Therefore, my average titre was 20.075cm3. Concentration of Sodium Carbonate Solution I am now going to calculate the concentration of the sodium carbonate solution: 2.68g of sodium carbonate was dissolved in a 250cm3 volumetric flask using water, so I need to find out how many moles of the substance I used in order to find out the concentration. Therefore I need to use the equation: Number of Moles= Mass (g)/Molar Mass (gmol-1) Molar mass of Na2CO3 = (23 x 2) + 12 + (16 x 3)= 106gmol-1 Number of Moles= 2.680g/ 106gmol-1 Number of Moles= 0.0253moles. Therefore, I used 0.0253 moles in my standard solution. I now need to use the equation to find the concentration: Concentration (moldm-3) = Number of moles/Volume (dm3) I firstly need to convert 250cm3 to dm3 so that my equation works: 1000cm3 = 1dm3 250cm3 = 0.250dm3 (I divided by 1000). Concentration (moldm-3) = 0.0253moles/0.250dm3 Concentration= 0.101moldm-3 Consequently, I have calculated my sodium carbonate standard solution to have a concentration of 0.101moldm-3, rounded to three significant figures. Concentration of acid I am now going to calculate the concentration of the acid solution; therefore I firstly need to find out how many moles there is of the sodium carbonate solution, by using the equation: Concentration of Na2CO3 (moldm-3) x Volume of Na2CO3(dm3) = Number of moles of Na2CO3 0.101moldm-3 x (25/1000) dm3) =0.00253 moles The equation of my reaction is: Na2CO3 (aq) + H2SO4 (aq) Na2SO4 (aq) + CO2 (g) + H2O(l) This equation shows that the molar ratio of sodium carbonate and sulphuric acid is 1:1 which means is there is 0.00253 moles of sodium carbonate there is 0.00253 moles in sulphuric acid. The average titre as shown above was 20.075cm3, which I need to convert to dm3 which is: 20.075cm3/1000 = 0.0201dm3. I can now use the equation Concentration (moldm-3)= Number of moles/Volume (dm3) Concentration (moldm-3)= 0.0253 / 0.0201 Concentration = 0.126moldm-3. Overall, I conclude that the concentration of the acid solution is 0.126moldm-3.

The Civil Rights Act of 1964 Essay -- Civil Rights, Segregation, Equal

Before the Civil Rights Act of 1964, segregation in the United States was commonly practiced in many of the Southern and Border States. This segregation while supposed to be separate but equal, was hardly that. Blacks in the South were discriminated against repeatedly while laws did nothing to protect their individual rights. The Civil Rights Act of 1964 ridded the nation of this legal segregation and cleared a path towards equality and integration. The passage of this Act, while forever altering the relationship between blacks and whites, remains as one of history’s greatest political battles. Racial unrest by the summer of 1963 was at its height since the Civil War. President Kennedy picked up the situation at the close of the Eisenhower years at a time when tensions were rapidly increasing. By the summer of 1963, however, after a series of violent demonstrations in the South, particularly in Birmingham, Alabama, President Kennedy pushed for a very strong civil rights bill in Congress. The first of its kind since the Civil War, this bill drastically called for the end of all segregation in all public places. In the eyes of the civil rights movement leaders, this bill was long over due. Kennedy’s crusade began slowly to the dismay of many civil rights leaders in February of 1963. He began by sending the United States Congress a â€Å"Special Message on Civil Rights,† stating, Our Constitution is color blind, ...but the practices of the country do not always conform to the principles of the Constitution... Equality before the law has not always meant equal treatment and opportunity. And the harmful, wasteful and wrongful results of racial discrimination and segregation still appear in virtually every aspect of national life, in virtually every part of the nation (Loevy, 5). Kennedy received praise for these strong and moving words yet was criticized for his weak legislative proposals to remedy the situation. By May of 1963, his proposal would change greatly however, after two men, from opposite positions set the civil rights movement into intense motion. Martin Luther King despite advice to do otherwise began massive protests in the street of Birmingham. To combat these protests, Police Commissioner â€Å"Bull† Conner used any means, including dogs, fire hoses, and electric cattle prods on protestors. Making newspapers and televi... ...tates on a social level but politically too. This bill set the precedent for using a cloture to stop a filibuster in the Senate. Similar cloture votes in 1966 and 1968, with bills for equal voting rights and guaranteed equal housing respectively were used to stop Southern filibusters. The Civil Rights Act also proved that mass demonstration and peaceful protesting are heard in Washington D.C. Martin Luther King and the Leadership Conference started with nothing and achieved everything. From the segregated South those who fought for the Civil Rights Act of 1964 changed the course of American history and ridded the nation of inequality under the law. Works Cited Berman, Daniel M., A Bill Becomes a Law, The Macmillan company, New York: 1966. Levy, Peter B., The Civil RIghts Movement, Greenwood Press, Westport, Connecticut, 1998. Web. 24 June 2015. https://www.questia.com/read/10045885/the-civil-rights-movement Loeby, Robert D.,To End All Segregation, University Press of America, Maryland: 1990. Whalen, Charles and Barbara, The Longest Debate, Seven Locks Press, Washington D.C.:1985. Web. 3 July 2015. http://www.jstor.org/stable/27550291?seq=1#page_scan_tab_contents

The UA&P Hallmark Programs

Last September 22, 2000 was the People Development Day of the University of Asia and the Pacific (UA&P). It was highlighted with a program that became a gathering of the high ranking personalities the university has like the UA&P president, Dr. Mario D. Camacho; the Dean of the College of Arts and Sciences, Dr. Antonio Torralba; the Vice President for Administrative Affairs, Dr. Josemaria Mariano; and the program director of the People Development, Mr. Jun Papelleras. Dr. Antonio Torralba discussed the UA&P hallmark programs which I am going to tackle throughout this paper. The word hallmark means a distinguishing characteristic sign, trait, or feature that makes one unique. In the case of the UA&P, it has three hallmark programs which are namely: values education; people development; and research and communication. In the field of values education, the UA&P is committed to teach its students with the right and proper values and attitudes that will help not only for the betterment of the society but also for their common good. As a matter of fact, the university offers courses in social and professional system of moral values. With this, the UA&P aims to develop students with discipline, diligence, spirit of enterprise, integrity, social solidarity, and universal outlook. The second hallmark program of the UA&P is the people development. In this field, the university students are trained to be: environmentally aware in our surroundings; cooperative to others; values oriented; concern to their health and to the proper food nutrition; saves for mobilization; and properly educated persons. The UA&P believes that through these six programs of people development, the students will achieve its fullest potential as a well being. The last hallmark program of the UA&P is the research and communication which is the foundational aims of its forerunner, the Center for Research and Communication. It is said that the UA&P continues its researches with the humanistic, professional, scientific and technical knowledge for the common good of the society. The university, through research and communication, aims to be a tool for the upliftment of the moral and social status of society. Truly, the UA&P makes a difference through its three major hallmark programs as compare to the other universities and institution in the land. And that makes the UA&P unique and one of a kind. The UA&P Hallmark Programs Last September 22, 2000 was the People Development Day of the University of Asia and the Pacific (UA&P). It was highlighted with a program that became a gathering of the high ranking personalities the university has like the UA&P president, Dr. Mario D. Camacho; the Dean of the College of Arts and Sciences, Dr. Antonio Torralba; the Vice President for Administrative Affairs, Dr. Josemaria Mariano; and the program director of the People Development, Mr. Jun Papelleras. Dr. Antonio Torralba discussed the UA&P hallmark programs which I am going to tackle throughout this paper. The word hallmark means a distinguishing characteristic sign, trait, or feature that makes one unique. In the case of the UA&P, it has three hallmark programs which are namely: values education; people development; and research and communication. In the field of values education, the UA&P is committed to teach its students with the right and proper values and attitudes that will help not only for the betterment of the society but also for their common good. As a matter of fact, the university offers courses in social and professional system of moral values. With this, the UA&P aims to develop students with discipline, diligence, spirit of enterprise, integrity, social solidarity, and universal outlook. The second hallmark program of the UA&P is the people development. In this field, the university students are trained to be: environmentally aware in our surroundings; cooperative to others; values oriented; concern to their health and to the proper food nutrition; saves for mobilization; and properly educated persons. The UA&P believes that through these six programs of people development, the students will achieve its fullest potential as a well being. The last hallmark program of the UA&P is the research and communication which is the foundational aims of its forerunner, the Center for Research and Communication. It is said that the UA&P continues its researches with the humanistic, professional, scientific and technical knowledge for the common good of the society. The university, through research and communication, aims to be a tool for the upliftment of the moral and social status of society. Truly, the UA&P makes a difference through its three major hallmark programs as compare to the other universities and institution in the land. And that makes the UA&P unique and one of a kind.

Gay Marriage Should Be Legal Essay - 1786 Words

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