Answer
KAl(SO4)2·12H2O. The older textbook form K2SO4·Al2(SO4)3·24H2O describes the same salt.
Detailed question
What is the formula of potash alum?
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KAl(SO4)2·12H2O. The older textbook form K2SO4·Al2(SO4)3·24H2O describes the same salt.
What is the formula of potash alum?