(2) (8 pts) The buffer solution produced at the beginning of the Group IIl proce
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Question
(2) (8 pts) The buffer solution produced at the beginning of the Group IIl procedure is approximately 1.2 M NH.CI and 1.0 M NHs. Calculate the hydroxide ion concentration in this solution. Kb for NHs is 1.8 x 105 475 The formation constant, K;, for Ni(NHs) is 5.5 x 10. Calculate the concentration of free nickel ion in a solution that contains 0.012 M Ni2+ and 1.0 M NHs. Use the hydroxide ion concentration and the nickel concentration you calculated to determine whether Ni(OH)2 should precipitate from this solution. Ksp for Ni(OH)2 is 2.8 x 10-16,Explanation / Answer
[OH^-] = 0.000014825M
[Ni^2+] = 0.006456M
Ni(OH)2 (s) ---------------------> Ni^2+ (aq) + 2OH^-(aq)
Qsp = [Ni^2+][OH^-]^2
= 0.006456*(0.000014825)^2
= 1.42*10^-12
Ksp for Ni(OH)2 is 2.8*10^-16.
Qsp> Ksp precipitate will form.
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