Suppose you have a solution that might contain any or all of the following catio

Question

Suppose you have a solution that might contain any or all of the following cations:  Cu2+, Ag+, Ba2+, and Mn2+.  Addition of HCl causes a precipitate to form.  After the precipitate is filtered off, H2SO4 is added to the supernate and another precipitate forms.  This precipitate is filtered off, and a solution of NaOH is added to the supernatant liquid until it is strongly alkaline.  No precipitate is formed.  Which ions are present in  each of the precipitates?  Which cations are not present in the original solution?

Explanation / Answer

Cu2+, Ag+, Ba2+, and Mn2+ & w/ addition of HBr --> ppts only AgI

Cu2+, Ba2+, and Mn2+ & w/ addition of H2SO4 --> ppts only BaSO4

Cu2+ & Mn2+ & w/ addition of NaOH --> no ppt , means no Cu2+ or Mn2+

Therefore

Ag+ is present in the first ppt as AgI
Ba+2 is present in the second ppt as BaSO4
Cu+2 & Mn+2 are not present

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