Question

Suppose you have a solution that might contain or all of the following cations: Cu2+, Ag+, Ba2+, and Mn2+. Addition of HBr causes a precipitate to form. After the precipitate is filtered off, H2SO4 is added to the supernate 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?

Answer 1

Bat2 is the cations for your question

Answer 2

Answer:

Both Ba2+ and Ag+ are present.

Neither Cu2+ nor Mn^2+ are present.

Explanation:

Hello,

At first, the addition of HBr promotes the precipitation of AgBr as it is largely insoluble in water. Next, the addition of H2SO4 promotes the precipitation of BaSO4 as it is largely insoluble in water as well.

Finally, as no precipitate was formed due to the addition of sodium hydroxide and both Cu(OH)2 and Mn(OH)2, one concludes they aren't present into the solution.

Best regards.