Pink solution forms a blue precipitate, , Blue precipitate dissolves to form a pale yellow solution, , Pale yellow solution oxidises on air to the darker yellow (brown) solution, , Pink solution gradually changes to blue, , Yellow-brown solution forms a brown precipitate, , Green solution forms a green precipitate, , Green precipitate dissolves to form a green solution, , Green precipitate dissolve, but eventually violet or purple solution forms, , Green solution changes to yellow, , Yellow solution changes into an orange solution, , The colour changes from orange to green, , The colour changes from green to blue, , Pale pink solution forms a brown precipitate, which doesn’t dissolve in excess aqueous sodium hydroxide, , Yellow solution turns into light blue, , Green solutions turns into purple.

Colour changes

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