Question

Which of the following titrations is
complexometric titration?

Ans.
Estimation of sodium chloride
Estimation of sodium benzoate
TH
Estimation of calcium gluconate
Estimation of barium sulphate​

Answer 1

Answer:

estimation of barium sulphate is the correct answer

Explanation:

hiii

Answer 2

Answer:

Estimation of calcium gluconate is done by complexometric titration

Explanation:

The solution of calcium gluconate is titrated with EDTA (Ethylenediamine tetraacetic acid ) which is why it is called complexometric titration. EDTA is a complex which forms a complex molecule with $Ca^+^2$ thus reducing calcium ion concentration in the solution. Once all the calcium ions form complex with EDTA, the solution will change color based on the indicator used. Thus indicating completion of the reaction.

By using

$N_1V_1 = N_2V_2$

The unknown concentration of calcium gluconate can be found.