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प्रश्न
How is orthophosphoric acid prepared from rock phosphate?
अति संक्षिप्त उत्तर
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उत्तर
When calcium phosphate (rock phosphate) is digested with a calculated quantity of dilute sulphuric acid, orthophosphoric acid is obtained.
\[\ce{Ca3(PO4)2 + 3H2SO4 + 2H3PO4}\]
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