Question

solubility of Ni(OH)2 will be maximum in a) 0.1M aq solution of Nis b) 0.1M aq solution of naoh c)0.1 M aq solution of ca(OH)2 d) 0.1M aq solution of H2SO4​

Answer 1

Answer:

AM and nice have a good relationship with the Nizam family in short

Answer 2

solubility of Ni(OH)₂ will be maximum in

(a) 0.1 M aq solution of NiS

(b) 0.1 M aq solution of NaOH

(c) 0.1 M aq solution of CA(OH)2

(d) 0.1 M aq solution of H2SO4

solution : let ionic product of Ni(OH)₂ is K

Ni(OH)₂ ⇔Ni²⁺ + 2OH¯

case 1 : a) Ni²⁺ = 0.1 M

so, K = [Ni²⁺][OH¯]² = 0.1(2S)²

⇒S = √(K/0.4) ...(1)

case 2 : b) OH¯¹ = 0.1

so, K = [Ni²⁺][OH¯]² = S(2S + 0.1)²

= 4S² + 0.01S + 0.4S² ≈ 0.01S

S = K/0.01 ...(2)

case 3 : c) OH¯¹ = 0.2M

so, K = [Ni²⁺][OH¯]² = S(2S + 0.2)²

= 4S³ + 0.8S² + 0.04S ≈ 0.04S

S = K/0.04 ...(3)

case 4 : d) K = s(2s)² = 4s³

s = (K/4)⅓

we see, solubility will be maximum in option (b) 0.1 M aq solution of NaOH