#3 R&D Exp. 26 Should Cu(OH)2 precipitate in 3 M NH3 if the original [Cu2+] is...

#3 R&D Exp. 26

Should Cu(OH)₂ precipitate in 3 M NH₃ if the original [Cu²⁺] is 0.1 M ( the K_b for ammonia is 1.6x10^-5)?

Please show work and explain a little of how you got this result

Solutions

Expert Solution

In the above problem volumes are not mentioned, so we will consider that volume will remian almost constant even after mixing the two.

Now

NH3 + H2O --> NH4+ + OH-
initial 3M 0 0

equilibrium 3-x x x
Kb = [NH4][OH-]/[NH3] = 1.6X10^-5 = [x][x]/[3-x]

Its a weak base so x<<1

1.6X10^-5 = x^2 / 3

x^2 = 48X10^-6

x = 6.92X10^-3 = [OH-]

Now Ksp of copper hydroxide is

Cu(OH)2 <-----> Cu2+ + 2OH- Ksp = 4.8X10^-20

And Ionic product = [Cu+2][OH-] = 0.1 X 6.92X10^-3 = 6.92X10^-4

IP >>Ksp

so precipitate will form

queen_honey_blossom answered 2 weeks ago

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