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Calculate the percentage of available ch...

Calculate the percentage of available chlorine in a sample of 3.55g of bleaching powder which was dissolved in 100mL of water. 25mL of this solution, on treatment with KI and dilute acid, required 20 mL of 0.125 N sodium thiosulphate solution.

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To calculate the percentage of available chlorine in a sample of bleaching powder, we can follow these steps: ### Step 1: Determine the Normality of Sodium Thiosulphate Given that 20 mL of 0.125 N sodium thiosulphate solution was used, we can calculate the equivalents of sodium thiosulphate used. \[ \text{Equivalents of Na}_2\text{S}_2\text{O}_3 = \text{Volume (L)} \times \text{Normality} = 0.020 \, \text{L} \times 0.125 \, \text{N} = 0.0025 \, \text{equivalents} \] ...
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