This question is about analytical techniques used to identify cations and anions in aqueous mixtures.

State the characteristic flame colour produced by lithium ions ( $Li+\text{Li}^+$ ) during a flame test.

Identify a metal ion that produces a distinct pale green flame.

Explain why flame tests are generally unreliable for identifying individual metal cations when they are present in a mixed sample.

An analyst acidifies an unknown sample containing a halide ion with dilute nitric acid and then adds aqueous silver nitrate. A cream precipitate is observed. Name the halide ion present.

Describe a chemical test, including reagents and observations, to confirm the presence of sulfate ions ( $SO42−\text{SO}_4^{2-}$ ) in an aqueous solution.

This question is about analytical techniques used to identify cations and anions in aqueous mixtures.

State the characteristic flame colour produced by lithium ions ( $Li+\text{Li}^+$ ) during a flame test.

Identify a metal ion that produces a distinct pale green flame.

Explain why flame tests are generally unreliable for identifying individual metal cations when they are present in a mixed sample.

An analyst acidifies an unknown sample containing a halide ion with dilute nitric acid and then adds aqueous silver nitrate. A cream precipitate is observed. Name the halide ion present.

Describe a chemical test, including reagents and observations, to confirm the presence of sulfate ions ( $SO42−\text{SO}_4^{2-}$ ) in an aqueous solution.

8.3 Identification of ions by chemical and spectroscopic means

Question 22

Markscheme

8.3 Identification of ions by chemical and spectroscopic means

Question 22

Markscheme

8.3 Identification of ions by chemical and spectroscopic means

Question 22

8.3 Identification of ions by chemical and spectroscopic means Questions

8.3 Identification of ions by chemical and spectroscopic means

Question 22

8.3 Identification of ions by chemical and spectroscopic means Questions