Solution and solubility

Copper(ll) sulfate（CuSO₄） is a soluble salt.

Calcium sulfate（CaSO₄） is an insoluble salt.

Which row shows suitable reactants for preparing a pure sample of the named salt?

• A

• B

• C

• D

One of these forms is blue and the other is white.

The change between these two forms is reversible.

blue form ≒ white form

What is the blue form and how is the change from the blue form to the white form brought about?

• A

• B

• C

• D

Which reaction mixture will produce a precipitate?

• aqueous Na2CO3, and aqueous CuSO4

• dilute H2SO4 and aqueous NaOH

• dilute HNO3 and solid MgO

• solid CuO and dilute H2SO4

Each acid gives a characteristic family of salts. Sulfuric acid, for instance, always

produces sulfates. So hydrochloric acid（HCl） always produces a

• chlorine

• chloride

• chlorate

• chloric

Each acid gives a characteristic family of salts. Sulfuric acid（H₂SO₄）, for instance, always

produces sulfates（SO₄ ^2-）. Nitric acid（HNO₃） always produces a

• nitrogen

• nitric

• nitrate

• nitride

Each acid gives a characteristic family of salts. Sulfuric acid, for instance, always

produces sulfates. Phosphoric acid（H₃PO₄） always produces a

• phosphate

• phosphorus

• phosphoric

• phosphoride

Which term is a substance that is chemically combined with water

• insoluble

• soluble

• anhydrous

• hydrated substance

Which term is the water molecules present in hydrated crystals

• hydrated

• water of crystallisation

• dissolve

• dehydrate

Which term is a substance containing no water

• dehydrated substance

• solubility

• saturated

• unsaturated

Which type of ionic compound is always soluble

• chlorides

• nitrates

• carbonates

• sulfates