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Describe the manufacture of potassium di...

Describe the manufacture of potassium dichromate from chromite ore.

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`4FeCr_2O_4 + 8Na_2 CO_3 + 7O_2 to 8Na_2 CrO_4 + 2Fe_2O_3 + 8CO_2`
` 2Na_2CrO_4 + H_2SO_4 to Na_2Cr_2O_7 + Na_2SO_4 + H_2O`
`Na_2Cr_2 O_7 + 2KCl to K_2Cr_2O_7 + 2NaCl`
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