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A solution containing the following cations:Cu^2+, Ag^+, Ba^2+, and Mn^2+. HBr is added to that solution...

A solution containing the following cations:Cu^2+, Ag^+, Ba^2+, and Mn^2+. HBr is added to that solution and causes a precipitate to form. After the precipitate is filtered off, H2SO4 is added to the supernate, and another precipitate forms. This supernate is filtered off, and a solution of NaOH is added to the supernate liquid until it is strongly alkaline. No precipitate is formed. Which ions are present in each of the precipitate? Which cations are not present in the original solution?

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Answer #1

Silver precipitates when acid is added to solution and gives silver halides.

When HBr is added to the solution Cu2+, Ag+, Ba2+, and Mn2+ & HBr --> precipitates only Ag.

BaSO4 precipitates out as a salt.

Cu2+, Ba2+, and Mn2+ & addition of H2SO4 --> precipitates only BaSO4(salt)

Cu2+ & Mn2+ & addition of NaOH --> no precipitation , means no Cu2+ or Mn2+


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

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