0.300g of a chromium compound was oxidized to convert chromium to dichromate
0.300g of a chromium compound was oxidized to convert chromium to dichromate (Cr2O7 2-). An excess of iodide was added to the acidified solution and the liberated iodine was titrated with sodium thiosulfate (0.1000 moldm-3); 27.02 cm3 being required. Calculate the % (w/w) Cr in the compound.
Cr2O7^2- + 6 I- + 14 H+ > 2 Cr^3+ + 7 H2O + 3I2 (1)
I2 + 2 S2O3^2- > 2 I- + 2 S4O6^2- (2)
How do I work this out?
Cr2O7^2- + 6 I- + 14 H+ > 2 Cr^3+ + 7 H2O + 3I2 (1)
I2 + 2 S2O3^2- > 2 I- + 2 S4O6^2- (2)
How do I work this out?
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