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Potassium Dichromate

Question

Write the equations involved in the preparation of potassium dichromate from chromite ore.

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Solution

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The balanced equations in the manufacture of $K_{2} C r_{2} O_{7}$ from chromite ore are as given below:
Step I : roasting- conversion of chromite ore into sodium chromate
$4 F e O \cdot C r_{2} O_{3} + 8 N a_{2} C O_{3} + 7 O_{2} \to 2 F e_{2} O_{3} + 8 N a_{2} C r O_{4} + 8 C O_{2}$
Step II : Conversion of sodium chromate into sodium dichromate
$2 N a_{2} C r O_{4} + H_{2} S O_{4} \to N a_{2} C r_{2} O_{7} + N a_{2} S O_{4} + H_{2} O$
Step III : Conversion of sodium dichromate into potassium dichromate
$N a_{2} C r_{2} O_{7} + 2 K C l \to K_{2} C r_{2} O_{7} + 2 N a C l$

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