0.28 g of a commercial sample of K_(2)Cr_(2)O_(7) was dissolved in water. Excess of KI was added to it along with dilute H_(2)SO_(4). Iodine liberated was then titrated against sodium thiosulphate solution containing 24.82 g of Na_(2)S_(2)O_(3). 5H_(2)O per litre. The thiosulphate solution required was 50 mL. Find the percentage purity of the sample of K_(2)Cr_(2)O_(7).

0.28 g of a commercial sample of K_(2)Cr_(2)O_(7) was dissolved in wat

1.	0.28 g of a commercial sample of K_(2)Cr_(2)O_(7) was dissolved in water. Excess of KI was added to it along with dilute H_(2)SO_(4). Iodine liberated was then titrated against sodium thiosulphate solution containing 24.82 g of Na_(2)S_(2)O_(3). 5H_(2)O per litre. The thiosulphate solution required was 50 mL. Find the percentage purity of the sample of K_(2)Cr_(2)O_(7).
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