C5-5 Tests for Anions

What type of test measures physical properties such as colour?

What type of test measures numerical data.

When testing a sample it is not good practise to test the whole sample.

What type of sampling technique should be used?

• Representative Sampling

• Cluster Sampling
• Stratified Sampling
• Convenience Sampling

Which technique would you use to test the purity of a solid after you have crystallised it?

• Distillation

• Recrystalisation

• Melting point

• Batch sampling

Halide ions (chloride, bromide and iodide) can be positively identified using silver ions as each forms a precipitate with the silver ions:

Ag+ + X- -> AgX

What colour precipitate would be observed with chloride ions?

• White

• Cream

• Yellow

• Green

Halide ions (chloride, bromide and iodide) can be positively identified using silver ions as each forms a precipitate with the silver ions:

Ag+ + X- -> AgX

What colour precipitate would be observed with bromide ions?

• White

• Cream

• Yellow

• Green

Halide ions (chloride, bromide and iodide) can be positively identified using silver ions as each forms a precipitate with the silver ions:

Ag+ + X- -> AgX

What colour precipitate would be observed with iodide ions?

• White

• Cream

• Yellow

• Green

Sulphate ions can be positively identified by adding barium ions to the solution forming a precipitate:

Ba²⁺ + SO4^2- -> BaSO4

What colour precipitate would be observed?

• White

• Cream

• Yellow

• Green

To test for carbonate ions the carbonate is added to dilute acid.

A gas is produced how can we test for this gas and positively identify the carbonate?

• Oxygen is produced which relights a glowing splint.

• Hydrogen is produced which makes a squeaky pop.

• Carbon dioxide is produced which turns lime water milky.

• Chlorine is produced which turns blue litmus red and then colourless

A copper salt is added to silver nitrate. A yellow precipitate is formed. Which copper salt was added?

• Copper sulphate

• Copper carbonate

• Copper chloride

• Copper iodide