A buffer solution containing `0.25mol//L` of `NH_(4)CI` and `0.05mol//L` of `NH_(4)OH` is in equilibrium with `A1^(+3)` and `Mg^(2+)` ions. Calculate

Monjur Alahi

A buffer solution containing `0.25mol//L` of `NH_(4)CI` and `0.05mol//L` of `NH_(4)OH` is in equilibrium with `A1^(+3)` and `Mg^(2+)` ions. Calculate `[A1^(3+)]` and `[Mg^(2+)]` in solution.
`K_(b)(NH_(4)OH) = 2.0 xx 10^(-5), K_(sp)[Mg(OH)_(2)] = 6.0 xx 10^(-12), K_(sp) (A1(OH)_(3)) = 6 xx 10^(-32)`.


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Salim Ahmed Kawsar

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B. Not all the sulphide which dissolves remains as `S^(2-)`, most of it hydrolyses:
`S^(2-) +H_(2)O hArr HS^(Θ) + overset(Θ)OH`.

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