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SOLVED:Chromium has been investigated as a coating for steel cans. The thickness of the chromium film is determined by dissolving a sample of a can in acid and oxidizing the resulting Cr^3 to Cr2 O7^2- with the peroxydisulfate ion: S2 O8^2-(a q) Cr^3 (a q) H2 O(l) ⟶Cr2 O7^2-(a q) . SO4^2-( a q) H^ (a q) (Unbalanced) After removal of unreacted S2 O8^2-, an excess of ferrous ammonium sulfate [Fe(NH4)2(SO4)2 ·6 H2 O] is added, reacting with Cr2 O7^2- produced from the first reaction. The unreact
SOLVED:Chromium has been investigated as a coating for steel …
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