Aluminum Sulfate Chemical Formula

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Usually, when you hear about alum it is in reference to potassium alum, which is the hydrated form of potassium aluminum sulfate and has the chemical formula kalso 4 2 12h 2 o.However, any of the compounds with the empirical formula abso 4 2 12h 2 o are considered to be an alum.Sometimes alum is seen in its crystalline form, although it is most often sold as a powder.

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