Q.

20 mL of 0.02 M hypo solution is used for the titration of 10 mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of Cu2+ is found to be _____ × 10—2 M [nearest integer]

Given : 2Cu2++4ICu2I2+I2

             I2+2S2O322I+S4O62

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answer is 4.

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Detailed Solution

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neq.  of I2=neq of Na2S2O3=20×0.002×12×nmol of I2=0.4nmol of I2=0.2mmolnmol of Cu+2=0.2×2×103Cu+2=0.4×10310×103=0.04=4×102

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