The molecular formula of potash alum is
- A$KAl(SO_4)_2 \cdot 12H_2O$
- B$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 12H_2O$
- C$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
- D$KAl_2(SO_4)_3 \cdot 24H_2O$
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