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What mass of Pb^(2+) ion is left in ...

What mass of `Pb^(2+)` ion is left in solution at the end point .
(ii) 0.16 g of `N_(2)H_(4)` is dissolved in water and the total volume made up to 500 ml. Calculate the percentage of `N_(2)H_(4)` that has reacted with water at this dilution . The `K_(b)` for `N_(2)H_(4)` is `4.0 xx 10^(-6)` M .

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(i) 1165 mg (ii) 2%
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