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Titrations of Acids and Bases

Titrations of Acids and Bases - Disregarded Titrations of...

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Disregarded Titrations of Acids and Bases Karin Emanuelson and Ryan Kusy Mod 8
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Pre-Lab Questions: 1) Standardization is the process of determining the concentration of a solution. It is carried out by measuring the amount of acid in an unknown by the means of titration. 2) Titration is the technique of accurately measuring the volume of a solution required to react with another reagent. 3) Molarity is the most customary way of quantifying concentrations defined as the number of moles of solute per liter of solution. 4) The equivalence point is the moment at which stoichiometrically equivalent quantities are brought together. The end point is when the color change takes place during the titration. The difference is that the equivalence point is a theoretical point. It can only be estimated by observing the end point. 5) Parallax error results from not being at eye level with the meniscus while taking readings from a buret. These reading are incorrect and can throw off an experiment. 6) Water and CO 2 form carbonic acid which could throw off the test. 7) 3.78g H 2 C 2 O 4 -2H 2 O x 1 mol H 2 C 2 O 4 -2H 2 O = 0.030 mol H 2 C 2 O 4 -2H 2 O 126.08g H 2 C 2 O 4 -2H 2 O 200ml x 1 L = 0.200 L solution 1000ml Molarity = 0.030 mol H 2 C 2 O 4 -2H 2 O = 0.15 M H 2 C 2 O 4 -2H 2 O 0.200 L solution 8) 0.62g KHP x 1 mol KHP = 3.04 x 10 -3 mol KHP 204.2g KHP 50.0ml x 1 L = 0.05 L solution 1000ml Molarity = 3.04 x 10 -3 mol NaOH = 0.0608 M NaOH 0.05 L solution
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9) Purpose: The purpose of this lab was to become familiar with the techniques of titration, a volumetric method of analysis, in order to determine the amount of acid in an unknown. Reference : Nelson, John H. and Kemp, Kenneth C. Laboratory Experiments to accompany Chemistry: The Central Science , 9 th ed. Upper Saddle River, NJ: Pearson Education, Inc., 2003. Balanced Chemical Reactions: NaOH + KHP → NaKP + H 2 O HCl + NaOH → NaCl + H 2 O 2HCl + Na 2 CO 3 → 2NaCl + H 2 O + CO 2 Hazards and Safety Issues: Any acid or base that comes in contract with the skin may cause irritation Goggles and proper foot wear must be worn at all times Be careful when adding the indicator to the solution that none comes in contract with any other substance (skin, floor, clothes, etc).
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