A solution may contain the following ions Ag,MC and Na. No precptate forned when

Question

A solution may contain the following ions Ag,MC and Na. No precptate forned when 0.10 M HCI was added but a dark colored precipitate formed when H,S 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 fltrate with (NH.),CO resulted in a white precipitate. If no further tests were made then what conclusions can you draw? Select one: 24242+ A. possible ions present Cuz, Mn. Car, Na 0 B, possible ions present Cu2+, Mn2+, Ca C. possible ions present Cue, Mna Na +22+2 D, possible ions present Ag+, Cu2+, Mne Cap Na O D. possible ions present Ag, c ,M, C

Explanation / Answer

1. Correct Answer is B

Addition of H2S dark ppt because of Cu2+

In basic conditions addition of H2S dark ppt indiocate presence of Mn2+

Addition of (NH4)2CO3 it gives white ppt of CaCo3 indicate preesence of Ca2+

2. option B is wrong. Always Pka=-logka

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