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एलुमिनियम सल्फेट या साधारण फिटकरी की क्रिया NaOH से करायी जाती है।

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पहले ऐलुमिनियम हाइडाँक्साइड का सफेद अवक्षेप बनता है जो NaOH की अधिकता में विलेय सोडियम मेटा-एलुमिनेट (`Na_2AlO_2`) बनाता है।
`Al_2(SO_4)_3 + 6NaOH to 3Na_2SO_4 + 2Al(OH)_3 darr Al(OH)_3 + NaOH to NaAlO_2 + 2H_2O`

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