3NA Salts and The Periodic Table

To make copper(II) sulfate crystals from its salt solution,

• all of the water must be evaporated away.

• the precipitate must be washed.

• the hot and saturated solution must be allowed to cool. .

• excess acid must be present.

Which of the following is/are NOT NEEDED when making copper(II) sulfate crystals? Choose all possible answers.

• burette

• evaporating dish

• filter paper

• pipette

This is a

• pipette

• burette

• filter funnel

• conical flask

The salt solution obtained in step 5 is not pure because

• of the presence of the indicator.

• the student performed the titration too quickly.

• it is not crystallized.

• the apparatus was not rinsed properly.

For the salt to be pure, the titration must be

• repeated without the indicator.

• done quickly.

• done using another burette.

• done using another acid.

Which of the following method is used to make a salt (precipitate) that is insoluble in water?

• Titration

• Evaporation

• Crystallization

• Precipitation

Washing the precipitate with distilled water and filtering will

• dissolve and remove soluble impurities.

• dissolve the precipitate.

• produce crystals.

• produce a hot and saturated solution.

Which of the following compounds is SOLUBLE in water?

• Sodium sulfate

• Calcium oxide

• Magnesium hydroxide

• Lead(II) sulfate

Which of the following compounds are INSOLUBLE in water? Choose all correct answers.

• Potassium nitrate

• Silver chloride

• Copper(II) oxide

• Ammonium chloride

______ acid + Magnesium --> Magnesium nitrate + Hydrogen

• Sulfuric

• Nitric

• Hydrochloric

• Carbonic