20mL of 0.02 M hypo solution is used for the titration of 10mL 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⁺ + 4I^- ® Cu₂I₂ + I₂

I₂ + $2 S_{2} O_{3}^{2 -} \to 2 I^{-} + S_{4} O_{6}^{2 -}$

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7 months ago

$m e q o f l_{2} = m e q o f N a_{2} S_{2} O_{3} = 20 * 0.002 * 1$

2 * mmol of l₂ = 0.4

mmol of l₂ = 0.2 mmol

mmol of Cu²⁺ = 0.2 * 2 * 10^-3

$[C u^{2 +}] = \frac{0.4 * 1 0^{- 3}}{10 * 1 0^{- 3}} = 0.04 = 4 * 1 0^{- 2} M$

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