pH and salts

What happens to litmus paper in acidic solutions?

• Red litmus turns blue

• Blue litmus turns red

• Yellow litmus turns green

• Blue litmus stays blue

Universal indicator solution is usually green to begin with. What does this mean?

• It is acidic

• It is alkaline

• It is neutral

• It is weak

A liquid has a pH of 8. What does this mean?

• It is weakly acidic

• It is weakly alkaline

• It is neutral

• It is strongly alkaline

A liquid has a pH of 1. What does this mean?

• It must be sodium hydroxide solution

• It is strongly acidic

• It is weakly acidic

• It is weakly alkaline

Which acid could be used to make ammonium nitrate (a type of fertiliser)?

• Hydrochloric acid

• Sulfuric acid

• Nitric acid

• Ethanoic acid

Farmers use lime to neutralise their acidic soils. What sort of substance is lime?

• A base

• An acid

• A sharp tasting drink

• A fertiliser

Which salt is made when copper oxide and sulfuric acid react together?

• Copper sulfate

• Copper sulfuroxide

• Copper sulfide

• Copper citrate

What products are formed when a metal oxide reacts with an acid?

• A salt only

• A salt and water

• A salt, water and carbon dioxide

• A salt and hydrogen

What products are formed when a metal carbonate reacts with an acid?

• A salt only

• A salt and water

• A salt, water and carbon dioxide

• A salt, water and hydrogen

What is the name of the salt made from nitric acid and potassium hydroxide?

• Potassium nitride

• Potassium nitrate

• Potassium nitric

• Sodium nitrate