Preparation of insoluble salts

Choose all possible reactants that can be used to provide the cation to prepare the insoluble salt zinc carbonate

• zinc

• zinc hydroxide

• zinc sulfate

• zinc chloride

Answer explanation

(aq) reactants are needed for precipitation. As long as the options above as soluble in water, they are suitable.

Choose all possible reactants that can be used to provide the anion to prepare the insoluble salt silver chloride

• sodium chloride

• lead(II) chloride

• hydrochloric acid

• zinc chloride

Answer explanation

(aq) reactants are needed for precipitation. As long as the options above as soluble in water, they are suitable.

Choose the two reactants to produce magnesium carbonate, an insoluble salt

• magnesium

• magnesium oxide

• magnesium sulfate

• sodium carbonate

• zinc carbonate

Answer explanation

Two (aq) reactants are needed for precipitation. One of the reactants must contain the cation; the other must contain the anion

Choose two reactants to produce barium sulfate, an insoluble salt

• barium carbonate

• barium chloride

• barium metal

• lead(II) sulfate

• sulfuric acid

Answer explanation

Two (aq) reactants are needed for precipitation. One of the reactants must contain the cation; the other must contain the anion.

Sulfuric acid contains the sulfate anion.

When lead(II) chloride is prepared, the reactants used were lead(II) nitrate and potassium chloride.

What are the products of this reaction?

• aqueous lead(II) chloride and solid potassium nitrate

• solid lead(II) chloride and aqueous potassium nitrate

When lead(II) chloride is prepared, the reactants used were excess lead(II) nitrate and potassium chloride.

When filtered using a filter funnel, the solid lead(II) chloride formed is washed with distilled water. What substances are being removed from lead(II) chloride through this washing?

• lead(II) nitrate

• potassium chloride

• potassium nitrate

• lead(II) chloride

Answer explanation

The (aq) product of the reaction is potassium nitrate.

There is also excess lead(II) nitrate (which is left over as it did not react).

Hence these two aq subtances are removed via washing with distilled water.