Salt preparation

What safety equipment is important for this practical activity?

• Goggles and gloves

• A fume hood

• Safety boots

• Respirator

What apparatus is essential for warming the acid?

• Bunsen burner

• Water bath or larger beaker with hot water

• Tripod

• Evaporating basin

What is added to the sulfuric acid during the reaction?

• Copper sulfate solution

• Copper oxide powder

• Filter paper

• Residue

Why is copper oxide added until it is in excess?

• To speed up crystallisation

• To ensure all the acid reacts

• To produce more filtrate

• To increase evaporation

What is the purpose of filtration in this experiment?

• To heat the mixture

• To separate the copper sulfate solution from unreacted copper oxide

• To cool the mixture

• To measure the temperature

What is the filtrate?

• Residue of copper oxide

• Dilute sulfuric acid

• Copper sulfate solution

• Pure water

What is discarded after filtration?

• Filtrate

• Crystals

• Residue

• Gauze

Why is a Bunsen burner used during crystallisation?

• To heat the evaporating basin directly

• To produce hydrated crystals immediately

• To heat water in the beaker below the evaporating basin

• To filter impurities

How is the heat adjusted during crystallisation?

• By boiling the water rapidly

• By using a simmering flame

• By cooling the beaker frequently

• By stopping after 5 minutes

Why should all the water in the evaporating basin not be evaporated?

• To prevent overheating of the copper sulfate solution

• To speed up the drying process

• To avoid burning the crystals

• To ensure the residue is dry