Question

A sample of chromium-containing alloy weighing 3.450 g was dissolved in acid and all the chromium was oxidized to CrO4 2-

A sample of chromium-containing alloy weighing 3.450 g was dissolved in acid and all the chromium was oxidized to CrO4 2- . It was then found that 3.18 g of the Na2So3 was required to reduce the CrO4 2- to CrO2 – in a basic solution, with the SO3 2- being oxidized to SO4 2-.
a. Write a balanced equation for the reaction of CrO4 2- with SO3 2- in a basic solution?
b. HOw many grams of chromium were in the alloy sample?
c. What was the percentage by mass of chromium in the alloy?

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