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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: kimi85 on August 22, 2007, 04:29:30 AM

Title: solubility
Post by: kimi85 on August 22, 2007, 04:29:30 AM

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.

Title: Re: solubility
Post by: Yggdrasil on August 22, 2007, 04:40:26 PM

Can you eliminate any choices?

Title: Re: solubility
Post by: kimi85 on August 22, 2007, 10:34:17 PM

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

Title: Re: solubility
Post by: Yggdrasil on August 22, 2007, 10:54:46 PM

What is the reason for eliminating them?

Title: Re: solubility
Post by: kimi85 on August 23, 2007, 12:55:59 AM

I think because they are basic anions

Title: Re: solubility
Post by: Yggdrasil on August 23, 2007, 04:25:49 AM

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?

Title: Re: solubility
Post by: kimi85 on August 23, 2007, 05:54:52 AM

okay.

thank you. :)