When the following $1.0 \mathrm{mol} {\mathrm{dm}}^3$ aqueous solutions are arranged in order of increasing pH, which is the correct order?

I Ammonium chloride

II Ammonium ethanoate

III Sodium ethanoate

Predict and explain, using equations where appropriate, whether the following solution is acidic, alkaline, or neutral.

$0.1 \mathrm{mol} {\mathrm{dm}}^{-3}{ \mathrm{FeCl}}_3\left(\mathrm{aq}\right)$

Predict and explain, using equations where appropriate, whether the following solution is acidic, alkaline, or neutral.

$0.1 \mathrm{mol} {\mathrm{dm}}^{-3}{ \mathrm{NaNO}}_3\left(\mathrm{aq}\right)$

Predict and explain, using equations where appropriate, whether the following solutions are acidic, alkaline, or neutral.

$0.1 \mathrm{mol} {\mathrm{dm}}^{-3}{ \mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)$

A $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ ammonia solution is placed in a flask and titrated with a $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ hydrochloric acid solution.

Explain why the pH of the ammonia solution is less than $13$.

A $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ ammonia solution is placed in a flask and titrated with a $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ hydrochloric acid solution.

Estimate the pH at the equivalence point for the titration of hydrochloric acid with ammonia and explain your reasoning.

A $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ ammonia solution is placed in a flask and titrated with a $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ hydrochloric acid solution.

State the equation for the reaction of ammonia with water and write the ${\mathrm{K}}_{\mathrm{b}}$ expression for ${\mathrm{NH}}_3 \left(\mathrm{aq}\right)$.

A $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ ammonia solution is placed in a flask and titrated with a $0.10 \mathrm{mol} {\mathrm{dm}}^{-3}$ hydrochloric acid solution.

When half the ammonia has been neutralized (the half-equivalence point), the pH of the solution is $9.25$. Deduce the relationship between $\left[{\mathrm{NH}}_3\right]$ and $\left[{\mathrm{NH}}_4^{+}\right]$ at the half equivalence point.