Chapter 16, Problem 28QP

Interpretation Introduction

Interpretation:

The number of moles and pOH of given aqueous solutions is to be determined when the concentration of strong bases is given.

Concept introduction:

Molarity $\left(M\right)$ is defined as the concentration of a solution in terms of the number of moles $\left(n\right)$ of solute in one-liter solution. Mathematically, it is expressed as:

$M=\frac{n}{V}$ …… (1)

Here, $V$ is the volume of the solution in liters. Molarity is also defined as $\text{mol/L}$.

A strong base is an electrolyte that gets completely dissociated when dissolved in water to produce hydroxide ions and its conjugate acid.

${\text{BOH}}_{\left(\text{aq}\right)}\to {\text{B}}^{\text{+}}{}_{\left(\text{aq}\right)}+{\text{OH}}^{-}{}_{\left(\text{aq}\right)}$

pOH is the measure of basicity of a solution that depends on the concentration of hydroxide ions and the temperature of the solution.

The formula to calculate the pOH is:

$\text{pOH}=-\log \left[{\text{OH}}^{-}\right]$ …… (2)

The conversion factor to convert $\text{mL to L}$ is:

$\frac{1\text{ L}}{1000\text{ mL}}$