A qualitative analysis scheme often utilises the difference in the solubilities at various $p H$ values. If true write 1, else write 0.

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Answer 1
A qualitative analysis scheme often utilises the difference in the solubilities at various pH values. Qualitative analysis schemes are often based on selective precipitation of different cations. By carefully selecting reagents and conditions for reactions, groups of ions can be separated on the basis of their reactivity and the solubility of their salts.

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