Volumetric Analysis

 

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Very short answer questions [2 marks]

1. Define the terms 

a. Primary standard solution 

Ans: The substance whose standard solution can be prepared directly by dissolving the known weight of substance in certain volume of solution is called primary standard substance and the solution made from primary standard substance is called primary standard solution. E.g. solution of oxalic acid.

b. Acidimetry  

Ans: The method of determining the strength of acid by titrating it with the known volume of standard alkali solution is called acidimetry.

2. Define the terms 

a. Normality factor:

Ans: Normality factor (f) is the ratio of observed weight of substance and theoretical weight of substance 

Normality factor= observed weight / theoretical weight 

b. Secondary standard solution 

Ans: The solution whose strength is to be determined with the help of primary standard solution is called secondary standard solution.

3. What is the importance of calculating normality factor of solution during titration?

Ans: In oder to minimize the experimental error, normality factor of solution is calculated during titration.

Normality factor (f) is the ratio of observed weight of substance and theoretical weight of substance 

Normality factor= observed weight / theoretical weight 

4. Why is crystal oxalic acid regarded as a good substance for the preparation of primary standard solution?

Ans:  Oxalic acid is regarding as primary standard substance because it is available in pure state, non-toxic, high equivalent weight, non hygroscopic and deliquescent. So, it is used for the preparation of primary standard solution in titration.

5. Define the term

a. Semi normal solution 

Ans: If half gram equivalent of solute is present in one litre of solution then it is called semi-normal solution. It is denoted by N/2.

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