A \( 10 \mathrm{~mL} \) of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution liberate...

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A \( 10 \mathrm{~mL} \) of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution liberated iodine from \( \mathrm{KI} \) solution. The liberated iodine was titrated by \( 16 \mathrm{~mL} \) of \( \mathrm{M} / 25 \) sodium thiosulphate solution. Calculate the concentration of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution in grams per litre.

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