## Volumetric Analysis Interview Questions & Answers

1. Question 1. What Is Decinormal Solution?

The solution that contains 1/10th gram equivalent of solute in one liter of its solution is called decinormal solution.

2. Question 2. What Are The Requisites For A Substance To Be A Primary Standard ? Mention Its Examples.

The criteria for a solution to be primary standard solution are as follows:

1. It should be available in pure and dry state.
2. Its composition should not be changed on storage. i.e., It should not be toxic, volatile, hygroscopic and deliquescent.
3. It should be highly soluble in water without any change in its composition.
4. It should have higher molecular and equivalent weight.

Some of the examples of primary standard solution are:

Sodium carbonate (Na2CO3), Potassium dichromate (K2Cr2O7), oxalic acid (COOH)2.2H2­O,  Mohr’s salt etc.

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4. Question 3. What Is Normality ? How It Is Related To Molarity?

The number of gram equivalent of solute present in in 1 litre of the solution is called normality. It is represented by N.

Normality=Number of gram equivalent of solute/volume of solution in litre

It is related to molarity as:

Normality (N) = Molarity × Basicity of acid

also, Normality (N) = Molarity × Acidity of base

5. Question 4. What Is Normality Equation?

The equation which is used to determine the strength of unknown solution is called normality equation.

It’s mathematical equation is:

Volume of acid × Normality of acid = Volume of Base × Normality of base

6. Question 5. What Is The Maximum Weight That Can Be Weighed In A Chemical Balance?

100 Grams

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8. Question 6. What Is Titration?

The process of adding one solution from the burette to another in the titration flask in order to complete the chemical reaction involved, is known as titration

9. Question 7. What Is Indicator?

Indicator is a chemical substance which changes colour at the end point.

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11. Question 8. What Is End Point?

The stage during titration at which the reaction is just complete is known as the end point of titration

12. Question 9. What Is Secondary Standard Solution?

The standard solution whose concentration is measured with the help of primary standard solution is called secondary standard solution.

Example: NaOH, HCL, H2­SO4 etc.

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14. Question 10. What Are The Differences Between End Point And Equivalence Point?

End point is the point which indicates the completion of reaction by changing its color. It is indicated by the indicator. While equivalence point is the theoretical point at which the equivalent amount of titrand and titrant are added together.  It is a theoretical point.

15. Question 11. What Is Indicator And Write Its Types?

1. Self indicator
2. Internal indicator
3. External indicator
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17. Question 12. What Is Standard Solution?

The solution of accurately known strength is called the standard solution and it contains known weight of the solute in a definite volume of the solution.

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19. Question 13. Will You Read Upper Or Lower Meniscus Of Kmno4solution In A Burette?

Upper Meniscus in case colored solution.

20. Question 14. Differentiate B/w Equivalence & Endpoint In Titrations?

The point at which the reaction b/w titrant & titrate is just complete is called equivalence point or theoretical point.

The point at which a clear visual change is observed after the reaction b/w titranta and titrate is practically complete is end point.

Thus there exists a very small difference b/w the end point & equivalence point.

21. Question 15. What Is Meant By Equivalent Weight Of An Acid?

Equivalent weight of an acid is defined as the number of parts by mass of an acid that is neutralised completely by one equivalent weight of base.

Equivalent weight of an acid = molecular weight / basicity

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23. Question 16. What Is Meant By Equivalent Weight Of A Base?

Equivalent weight of a base is defined as the number of parts by mass of a base that is required to neutralise completely one equivalent weight of an acid.

Equivalent weight of a base = molecular weight / acidity

EX: Equivalent weight of NaOH =40/1=40

24. Question 17. Which Indicator Is Used In The Titration Of Sodium Carbonate Against Hydrochloric Acid And What Is The Colour Change At The End Point?

Methyl orange. The colour change is yellow to pinkish red

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26. Question 18. What Is Basicity Of An Acid?

It is the number of replaceable hydrogen atoms in molecule of the acid.

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28. Question 19. What Do You Mean By 1.0 M Solution?