5 standard solution & volumetric analysis

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Information about 5 standard solution & volumetric analysis
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Published on March 5, 2014

Author: felna00

Source: slideshare.net

 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?

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