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A concentrated strong acid is added to a...

A concentrated strong acid is added to a solid mixture of 0.015-mole samples of `Fe(OH)_2 and Ca(OH)_2` placed in one litre of water. At what value of pH will the dissolution of each hydroxide be complete (Assume negligible volume change) `K_(sp) [Fe(OH)_(2)]=7.9 xx 10^(-15) and K_(sp) [Cu(OH)_(2)]=1.6 xx 10^(-19)`

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