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Aluminum sulphate solution and calcium hydroxide solution produce a precipitate of aluminum hydroxide and solid calcium sulphate.​

User MrEdmundo
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Yes, that is correct.

When aluminum sulfate solution (Al2(SO4)3) and calcium hydroxide solution (Ca(OH)2) are mixed, a double displacement reaction occurs, resulting in the formation of solid aluminum hydroxide (Al(OH)3) and solid calcium sulfate (CaSO4). The balanced chemical equation for this reaction is:

Al2(SO4)3 + 3Ca(OH)2 → 2Al(OH)3 + 3CaSO4

The aluminum hydroxide precipitates out of the solution as a gelatinous solid, while the calcium sulfate forms a white solid. This reaction is commonly used in water treatment plants to remove impurities from drinking water, as the aluminum hydroxide acts as a coagulant that binds to particles and organic matter in the water, allowing them to be removed more easily.

User OHHH
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