Tend to have an astringent and acid taste. They are odourless, colourless and often found in the form of a white crystalize.
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Aluminum-based alums have been used since antiquity & are still important in many industrial processes.
They are soluble in water, have a sweetish taste, react as acid by turning blue to red, & crystalize.
In alums each metal ion is surrounded by six water molecules.
When heated, they liquefy, and if the heating is continued, the water crystallization is driven off.
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