Answer to Question #86669 in General Chemistry for Farhana Khatun

Question

For the aqueous NiCN4−2 complex =Kf×1.01031 at 25°C.

Suppose equal volumes of 0.0080M NiNO32 solution and 0.78M KCN solution are mixed. Calculate the equilibrium molarity of aqueous Ni+2 ion.

Round your answer to 2 significant digits.

Answer 1

Ni(NO3)2 + 2KCN = K2[Ni(CN)4] + 2KNO3

K2[Ni(CN)4]= 2K+ + [Ni(CN)4]2-

[Ni(CN)4]2-= Ni2+ + 4CN-

Kf=1.01031

=N2+ 1.0026.