Which of the following will be more soluble in an acidic solution than in pure water?
RbClO4, Cul, PbSO4,CuCN,Ni(OH)2
the salts that will be more soluble in an acidic solution than in pure water will be those that contain basic anions
accordingly your answer will be
Ni(OH)2 , CuCN
CuI , PbSO4 , & RbClO4
have I- , (SO4)-2 , & (ClO4)-1 ions
which are weak conjugate bases of the stron acids: HI, H2SO4, & HClO4
those ions will not react with the addition of H+ ion
nor will H+ ion combine with them
however Ni(OH)2 , CuCN both release ions which will react with H+ OH- & CN- aere strong conjugate bases of the
weak acids H2O & HCN, H+ will combine with those ions thus by removing them from solution,
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