Sunday, November 3, 2019

inorganic chemistry - Heating of potash alum


I have this reaction : $$\ce{K2SO4.Al2(SO4)3.24H2O -> K2SO4 + Al2O3 + 24H2O}$$ And I notice that while $\ce{Al2(SO4)3}$ becomes $\ce{Al2O3}$ it doesn't happen so with $\ce{K2SO4}$. Why ? I guessed that it would have to do something with the oxygen affinity of K. As $\ce{K2O}$ has less oxygen than $\ce{K2SO4}$ Am I right ?




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