Published on March 5, 2014
by dissolving a weighed amount of solid and adding sufficient solvent to make the desired volume by dilution of a more concentrated solution
errors error in weighing in volume measurement contamination
a method of determining the accurate concentration of solutions with the use of the technique called titration
is a process of determining the amount of a solution or substance of known concentration that is required to react completely with a certain amount of a sample that is being analyzed equivalents of acid = equivalents of base NAV A = NB V B
1. A 0.5225 g sample of pure potassium acid phthalate, (C6H4COOHCOOK) is dissolved and titrated with 24.5 mL of a base solution using phenolphthalein indicator. What is the Normality of the base solution?
1. In another titration it was found that 21.85 mL of 0.1001 N acid solution were needed to react with 23.1 mL of a base solution.
1. How many milliliters of 0.120 M HCl are needed to completely neutralize 50.0 mL of 0.101 M Ba(OH)2 solution? 2. How many milliliters of 0.125 M H2SO4 are needed to neutralize 0.200 g of NaOH?
3. If 42.7 mL of 0.208 M HCl solution is needed to neutralize a solution of Ca(OH)2, how many grams of Ca(OH)2 must be in the solution?
Volumetric analysis are analytical procedures which involve titration with a standard
Percentage Acidity in sample %acidity = Vb x Nb x eq.weight of acid Mass of sample x 100 Percentage alkalinity in sample %alkalinity = Va x Na x eq.weight of base x 100 Mass of sample
Example: 1. What is the percentage of total acid expressed as acetic acid (CH3COOH) in a sample of vinegar if 3.0 g of vinegar require 20.50 mL of 0.1150N KOH for an endpoint with phenolphthalein indicator?
Experiment 9 A Volumetric Analysis ... solution, now a secondary standard solution, ... 112 A Volumetric Analysis 5! 6 5.
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... Volumetric analysis, standard solutions ... activity 5 - Volumetric analysis ... Dilution solution (a) ...
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