Chapter 15, Problem 15.87QE

(a)

Interpretation Introduction

Interpretation:

Solution of $0.050M\text{ NaF}$ has to be classified as either strongly acidic, weakly acidic, neutral, weakly basic, and strongly basic.

Concept Introduction:

The ionization of a hypothetical weak base is given as follows:

  $\text{B}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)\rightleftharpoons {\text{BH}}^{\text{+}}\left(\text{aq}\right)+{\text{OH}}^{-}\left(\text{aq}\right)$

The expression of ${\text{K}}_{\text{b}}$ is given as follows:

  $K_{\text{b}}=\frac{\left[{\text{BH}}^{+}\right]\left[{\text{OH}}^{-}\right]}{\left[\text{B}\right]}$

Here,

$\left[\text{B}\right]$ denotes the concentration of hypothetical weak base.

$\left[{\text{OH}}^{-}\right]$ denotes the concentration of ${\text{OH}}^{-}$ ions.

$\left[{\text{BH}}^{+}\right]$ denotes the concentration of ${\text{BH}}^{+}$ ions.

$K_{\text{b}}$ denotes ionization constant of weak base.

(b)

Interpretation Introduction

Interpretation:

Solution of $0.100M\text{ KCl}$ has to be classified as either strongly acidic, weakly acidic, neutral, weakly basic, and strongly basic.

Concept Introduction:

Spectator ions are regarded as ions that do not appear in the net ionic equation of an acid-base reaction. This is because they are usually the conjugate base corresponding to strong acids such as chloride, iodide, bromide, or nitrate ions.

(c)

Interpretation Introduction

Interpretation:

Solution of $0.080M{\text{ NH}}_{\text{4}}\text{Br}$ has to be classified as either strongly acidic, weakly acidic, neutral, weakly basic, and strongly basic.

Concept Introduction:

Refer to part (a).