[kimi85]

Which of the following solids is (are) likely to be more soluble in basic solution that in pure water: BaSO₄, H₂C₂O₄, Fe(OH)₃, NaNO₃, or MnS?

Thank you very much.

[Yggdrasil]

Can you eliminate any choices?

[kimi85]

I think Fe(OH)3, MnS, BaSO4 and oxalic acid can be eliminated..

[Yggdrasil]

What is the reason for eliminating them?

[kimi85]

I think because they are basic anions

[Yggdrasil]

I'm not sure that basic anions will necessarily mean that a salt will be less soluble in basic solution.  Fe(OH)₃ will definitely be less soluble in a basic solution because of the common ion effect.  But, for the others, this is not the case.

Instead, think of the products from the dissolution of each salt.  Will any of the ions react with OH^- and thus aid in the dissolution process?

[kimi85]

okay.

thank you.