Test for anions

A chloride salt will give what result when nitric acid and silver nitrate are added?

• white precipitate

• white

• cream

• cream precipitate

A cream precipitate produced from an unknown salt with nitric acid and silver nitrate means the anion is?

• chloride

• bromide

• iodide

• sulphate

A yellow precipitate is formed from an iodide salt when what is added?

• nitric acid

• silver nitrate

• barium chloride

• hydrochloric acid

A white precipitate forms when an unknown salt is reacted with barium chloride. What is the anion?

• sulphate

• chloride

• bromide

• carbonate

What gas is formed when a carbonate reacts with an acid

• oxygen

• carbon dioxide

• hydrogen

• chlorine

What would you observe if carbon dioxide gas is bubbled through limewater

• a white precipitate forms

• the limewater goes cloudy/milky

• the limewater goes clear

• the limewater goes colourless

What would you observe if carbon dioxide gas is bubbled through limewater

• a white precipitate forms

• the limewater goes cloudy/milky

• the limewater goes clear

• the limewater goes colourless

Why do we add nitric acid before silver nitrate when we test for a halide?

• To react away any impurities

• to separate the chloride so it can react

• to make the silver nitrate react

Why can't you use hydrochloric or sulfuric acids to test for anions?

• they don't react

• you need to test for both chloride and sulfate ions so can't use an acid that contains these

• they yield different products

• the pH is too low

What is a positive test for a carbonate ion?

• limewater turns cloudy

• limewater goes clear

• add barium sulfate

• add silver nitrate