Question 14 of 15 Incorrect Incorrect Incorrect Incorrect Incorrect Incorrect In

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Question 14 of 15 Incorrect Incorrect Incorrect Incorrect Incorrect Incorrect Incorrect Map a Sapling Learning macmillan learning solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H2S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H2S was again bubbled through the solution. A precipitate again formed and was filtered off. Finally, the solution was treated with a sodium carbonate solution, which resulted in no precipitation. Which metal ions were definitely present, which were definitely absent, and which may or may not have been present in the orginal mixture? Possibly present Definitely absent 2+ Ag Zn Ba Ni Cr2+ 4+ Sn 2+ Mg 2+. Pb 2+ Hg Hg2 Sb There is a hint available! View the hint by clicking on the bottom divider bar. Click on the divider bar again to hide the hint. Close A Previous Give Up & View Solution Check Answer Next Exit 8 Hint

Explanation / Answer

a)

HCl addition should precipitate Pb+2, Ag+ and Hg+2, therefore they are not present

b)

Addition of H2S in acidic --> Shoudl precipitate

Cu+2, Bi+3, Cd+2

c) addition of H2S in basic --> Ni+2, Fe+2, CO+2 Mn+2 and Zn+2 should precipitate

d)

carbonate should precipitate

Ba+2 and Sr+2, Ca+2, therefore those are not present

definetively --> Ni+2, Al+3, Bi+3, Zn+2,

absent --> Hg+2, Ob+2, Ca+2, K+, Ag+

possible --> Mg+2 + Cu+2 ,Sn+2

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