5. Consider a solution that contains ammonia and the Ni2 ion: Use your reasoning

Question

5. Consider a solution that contains ammonia and the Ni2 ion: Use your reasoning from the questions above to explain why the addition of 3M NH to Ni2 (aq) will precipitate the nickel out of solution. Write the corresponding reaction 3pts). If you continue adding ammonia to the above solution the precipitate will disappear. Use a chemical reaction to explain why the precipitate disappears (2pts). a. 3 (aq) b. 6. Consider the following separation scheme; Solution containing Ag', Pb2', and Cu2* Add HNO3 so pH-1 Add H2S, Heat Y (ag) Pb2) (ag), Pb2 NaCl (aq) ppt of Y and ID of Z Boil solution

Explanation / Answer

5a)

Ni+2 + 2NH3 + 2H2O --> Ni(OH)2 + NH4+

5b)

Ni(OH)2(s) + 2OH- --> Ni(OH)4-2(aq)

6a)

X must be Ag+ ions in form of AgCl and PbCl2 solids

6b)

adding more H2S --> Cu+2 + S-2 = CuS(s)

6c)

this must be Pb+2 in form of PbCl2 and PbS

6d)

you can check out the color, if PbS is yellow, and solution is yellow, then this is Pb+2

Ag2S = 2Ag+ + S-2

Ksp = [Ag+]^2[S-2]

6*10^-51 = (0.15)^2 ( S-2)

[S-2] = (6*10^-51)/ ( (0.15)^2

[S-2] = 2.6666*10^-49

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