Question

For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with pH. If the solubility does change, pick the pH at which you'd expect the highest solubility. You'll find K., data in the ALEKS Data tab. compound Does solubility change with pH? highest solubility pH = 2 | pH = 4 | pH = 5 Ba(OH)2 TO O Сасо, O O PbCI, x 6 ?

Answer 1

1) as the pH increases, the concentration of OH- increases and hence the solubility of Ba(OH)2 decreases. So, yes and pH 2.

2) As the pH decreases and hence the concentration of H+ ion increases, CO₃^2- ion combines with H+ ion to produce HCO₃^- and H2CO₃ . So, as pH decreases, more and more CO₃^2- ion is consumed. So, the solubility of CaCO3 increases. So, yes and pH 2.

3) as the pH increases, and hence the concentration of OH- increases, lead ions combine with OH- and precipitate as lead hydroxide. So, the solubility of PbCl2 increases but lead hydroxide precipitates. So, the answer should be yes and pH 5.

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