Chapter 6, Problem 6H.4BST

(a)

Interpretation Introduction

Interpretation:

The required volume of $\text{0}\text{.020}\text{M}{\text{NaOH}}_{\text{(aq)}}$ to reach first stoichiometric point in a titration of of 30.0 mL of $\text{0}\text{.010}\text{M}{\text{H}}_3{\text{PO}}_4{}_{\text{(aq)}}$ has to be calculated.

Polyprotic acid:

Polyprotic acid is an acid, which can donate minimum two or more than two protons from per molecule to an aqueous solution.  Diprotic and triprotic acids are commonly available polyprotic acids, it can able to donate or loss two and three protons, respectively.  The polyprotic acid shows more than one equivalence points in their titratin curves; it depends on the number of protons they possess.

(b)

Interpretation Introduction

Interpretation:

The required volume of $\text{0}\text{.020}\text{M}{\text{NaOH}}_{\text{(aq)}}$ to reach second stoichiometric point in a titration of 30.0 mL of $\text{0}\text{.010}\text{M}{\text{H}}_3{\text{PO}}_4{}_{\text{(aq)}}$ has to be calculated.

Concept introduction:

Refer to part (a).