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How is K(2)Cr(2)O(7) manufactured from c...

How is `K_(2)Cr_(2)O_(7)` manufactured from chromite ore.

Text Solution

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(i) Chromite ore in to sodium chromate
`4FeOCr_(2)O_(3) + 8Na_(2)CO_(3) + 7O_(2) to 2Fe_(2)O_(3) + 8Na_(2)CrO_(4) + 8CO_(2)`
(ii) Sodium chromate into sodium dichromate

`2Na_(2)CrO_(4) + H_(2)SO_(4) to Na_(2)Cr_(2)O_(7) + Na_(2)SO_(4) + H_(2)O`(iii) Sodium dichromate into potassium dichromate
`Na_(2)Cr_(2)O_(7) +2KCL to K_(2)Cr_(2)O_(7) +2NaCI`
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