Name a single reagent that could be used to distinguish between each of the following pairs of solutions; Name the indicator most suitable for the titration of each of the following pairs of solutions; Name two pieces of apparatus that are used in a titration experiment.

$\text{Na}_2\text{CO}_3$ will produce effervescence, while $\text{Na}_2\text{SO}_4$ will not.
Reagent: $\boxed{\text{Dilute hydrochloric acid}}$

a) (ii) $\text{KNO}_3(\text{aq})$ and $\text{KCl}(\text{aq})$

$\text{KCl}$ will form a white precipitate of silver chloride, while $\text{KNO}_3$ will show no reaction.
Reagent: $\boxed{\text{Silver nitrate solution}}$

a) (iii) $\text{Al}_2(\text{SO}_4)_3(\text{aq})$ and $\text{K}_2\text{SO}_4(\text{aq})$

$\text{Al}_2(\text{SO}_4)_3$ will form a white gelatinous precipitate, while $\text{K}_2\text{SO}_4$ will show no reaction.
Reagent: $\boxed{\text{Aqueous ammonia}}$

a) (iv) $\text{Ca}(\text{NO}_3)_2(\text{aq})$ and $\text{Cu}(\text{NO}_3)_2(\text{aq})$

$\text{Cu}(\text{NO}_3)_2$ will form a blue precipitate, while $\text{Ca}(\text{NO}_3)_2$ will form a white precipitate.
Reagent: $\boxed{\text{Sodium hydroxide solution}}$

b) Name the indicator most suitable for the titration of each of the following pairs of solutions:

b) (i) $\text{CH}_3\text{COOH}(\text{aq})$ and $\text{NaOH}(\text{aq})$

Indicator: $\boxed{\text{Phenolphthalein}}$

b) (ii) $\text{HNO}_3(\text{aq})$ and $\text{NH}_3(\text{aq})$

Indicator: $\boxed{\text{Methyl orange}}$

c) Name two pieces of apparatus that are used in a titration experiment.

Apparatus:

1. $\boxed{\text{Burette}}$
2. $\boxed{\text{Pipette}}$