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साधारण फिटकरी को गर्म किया जाता है।

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साधारण फिटकरी को गर्म करने पर `92^@C` पर यह पिघल जाती है। इसके क्रिस्टलन जल के अणु निकल जाते है और दरध फिटकरी (burnt alum) प्राप्त होती है जो अधिक गर्म करने पर अपघटित हो जाती है।
`K_2SO_4 . Al_2 (SO_4)_3 . 24H_2O overset(92^@C) to underset"(दग्ध फिटकरी)"(K_2SO_4. Al_2(SO_4)_3) + 24H_2O`
`K_2SO_4. Al_2(SO_4)_3 oversetDeltato Al_2O_3 + K_2O + 4SO_3`

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