Chapter 4.13, Problem 1PPA

Interpretation Introduction

Interpretation:

The amount of KHP (in grams) required to neutralize the given NaOH solution is to be calculated.

Concept Introduction:

Acid–base titrations are useful in determining the concentration of an unknown acid or a base.

The concentration of unknown solution can be determined by titrating it with a standard solution of a known concentration.

If volumes of standard and unknown solutions are known, the concentration of unknown solution can be estimated with the help of concentration of standard solution.

The solution of a strong base like NaOH needs to be standardized as its concentration might become unstable over time. It can be standardized using KHP, which is available in a highly pure form.

$\text{Molarity = }\frac{\text{moles }}{\text{Volume}}$.

So, number of moles can be calculated as $\text{Moles of NaOH = Molarity × Volume}$

The moles of a substance are expressed as $n=\frac{m}{\text{M}}$

So, the mass of a substance is given by the expression $m=\text{M}n$