Which of the equations below is correct for the following Ksp expression? Ksp = [Cd2+][OH-]2 Select one or more:
A. Cd2(OH)2(s) <---> 2Cd2+(aq) + 2OH2-(aq)
B. Cd(OH)3(s) <---> Cd3+(aq) + 3OH-(aq)
C. Cd(OH)2(s) <---> Cd +2(aq)+2OH-(aq)
D. Cd2+(aq) + 2OH-(aq) <---> Cd(OH)2(s)
E. Cd+(aq) + OH-(aq) <---> CdOH(s)
A. Cd2(OH)2(s) <---> 2Cd2+(aq) + 2OH2-(aq)
B. Cd(OH)3(s) <---> Cd3+(aq) + 3OH-(aq)
C. Cd(OH)2(s) <---> Cd +2(aq)+2OH-(aq)
D. Cd2+(aq) + 2OH-(aq) <---> Cd(OH)2(s)
E. Cd+(aq) + OH-(aq) <---> CdOH(s)
1 Answer
Mar 31, 2018
C:
#"Cd"("OH")_2(s) rightleftharpoons "Cd"^(2+)(aq) + 2"OH"^(-)(aq)#
Explanation:
For a given solubility equation:
#wAB(s) -> xA^(z+)(aq)+ yB^(z-)(aq)#
#K_(sp)=[A^(z+)]^x[B^(z-)]^y#
Same as every other equilibrium expression, solids and liquids are included as
The reason why D is incorrect is because the ratio of products over reactants for
#K_(sp)=1/([Cd^(2+)][OH^-]^2)#