Chemistry 5070 · O Level · Identification of ions and gases

Identification of ions and gases — practice question

A sample of river water is examined for pollutants.
(main)[5]

Complete the table with the tests, the observations and the pollutant ions found in the sample.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “NaOH produces a white ppt soluble in excess → Al^{3}⁺” …

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