(A) The general formula for alum is $M_2SO_4 \cdot R_2(SO_4)_3 \cdot 24H_2O$.Here,$M$ represents a monovalent cation (e.g.,$K^{+}$,$Na^{+}$) and $R$ r

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$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$

(A) The general formula for alum is $M_2SO_4 \cdot R_2(SO_4)_3 \cdot 24H_2O$.Here,$M$ represents a monovalent cation (e.g.,$K^{+}$,$Na^{+}$) and $R$ represents a trivalent cation (e.g.,$Al^{3+}$,$Fe^{3+}$).Therefore,$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$ is the correct formula for potash alum.