A sample of a chromium-containing alloy weighing 3.450 g was dissolved in acid, and all the chromium in the sample was oxidized to 2cro42-. it was then found that 3.18 g of na2so3 was required to reduce the 2cro42 - to cro2 - in a basic solution, with the so32 - being oxidized to so42-. write a balanced equation for the reaction of 2cro42 - with so32 - in a basic solution.

Question

Chemistry

Naima Wallace

7 February, 18:57

A sample of a chromium-containing alloy weighing 3.450 g was dissolved in acid, and all the chromium in the sample was oxidized to 2cro42-. it was then found that 3.18 g of na2so3 was required to reduce the 2cro42 - to cro2 - in a basic solution, with the so32 - being oxidized to so42-. write a balanced equation for the reaction of 2cro42 - with so32 - in a basic solution.

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Tristin Sheppard · Answer 1

Reduction half reaction

2H_2O + CrO_4^2 - + 3e - > CrO_2^ - + 4OH^-

Oxidation half reaction

2OH^ - + SO_3^2 - - > SO_4^2 - + H_2O + 2e

Balanced overall equation

H_2O + 2CrO_4^2 - + 3SO_3^2 - - > 3SO_3^2 - + 2CrO_2^ - + 2OH^-