ofCl is required tu TuIIJ Colpi hat concentration ncentration is 0.2 M (3pts)? A
ID: 556870 • Letter: O
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ofCl is required tu TuIIJ Colpi hat concentration ncentration is 0.2 M (3pts)? Assume the concentration of [Ag'] is 0.1 M. Your ar ould be listed as a molar concentration. ow can you apply this knowledge to the qualitative analysis separation scheme? D pts). e the table of Kip and Ky values in your lab manual to provide two other example ere a precipitate and a complex ion might both form (2pts). ler a solution that contains ammonia and the Ni2+ ion: e your reasoning from the questions above to explain why the addition of Ni2 (aq) will precipitate the nickel out of solution. Write the corresponding reac ts). ou continue adding ammonia to the above solution the precipitate will disapp emical reactionsto explain why the precipitate disappears (2pts). following separation scheme Solution containing Agt, Pb2*, and Cu2* Add HNO3, so pH-1 Add H2S, Heat (aq)> NaCl (aq) 21 (aq) Boil solution 1Explanation / Answer
Qualitative analysis of cations
1. The composition of X is Ag2S which is formed by the precipitation of Ag+ upon addition of H2S.
2. If we continue adding H2S to the solution, we would get CuS formation as a precipitate.
3. Identity,
W = PbCl2
Q = Pb2+(aq) + 2Cl-(aq) PbCl2 dissolves upon heating
Z = CuCl2
Y = Cu(OH)2
c. The confirmatory tests for each ion would be,
Ag+ + HCl --> AgCl (white ppt)
Pb2+ + CrO4^2- --> PbCrO4 (yellow ppt)
Cu2+ + K4Fe(CN)6 --> Cu2[Fe(CN)6] (red-brown ppt) + 4K+
e. minimum [S^2-] required to precipitate Ag+ = Ksp/[Ag+]
= 6 x 10^-51/0.15 = 4 x 10^-50 M
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