16. A solution may contain the following ions Ag+, Cu2+, Mn2+, Ca2+, and Na+. No

Question

16. A solution may contain the following ions Ag+, Cu2+, Mn2+, Ca2+, and Na+. No precipitate formed when 0.10 M HCl was added but a dark colored precipitate formed when H2S was added to an acidic portion of the solution. After the removal of the solid the solution was made basic and more H2S was added and a dark precipitate again formed. Treatment of the filtrate with (NH4)2C03 resulted in a white precipitate. If no further tests were made then what conclusions can you draw? (a) possible ions present Cu2+ , Mn2+,Ca2+,Na2+ (b) possible tons present Cu2+ , Mn2+ , Ca2+ (C) possible ions present Cu2+ , Mn2+ , Na2+ (d) possible ions present Ag2+, Cu2+ , Mn2+,Ca2+,Na2+ (e) This qualitative analysis is inconclusive.

Explanation / Answer

(a) Possible ions present Cu2+, Mn2+, Ca2+

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