Q.

Molar solubility of Ni(OH)2 in 0.5 M Ca(OH)2 is _________

(Ksp of Ni(OH)2=2×10-15M)

1 2×10-13 M  
2 2×10-14 M  
3 2×10-15 M  
4 2×10-16 M  

Ans.

(3)

Ni(OH)2→Ni2++2OH-

2×10-15=x

x=2×10-15