Why is al2(so4)3 acidic?
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Al2(SO4)3, Al3+ is an acidic cation, in that it forms complexes with the water molecules such that the H-atoms is pointing outward
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Aluminium sulfate is sometimes used to reduce the pH of garden soil, as it hydrolyzes to form the aluminium hydroxide precipitate and a dilute sulfuric acid solution. An example of what changing the pH level of soil can do to plants is visible when looking at Hydrangea macrophy
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