Question

Ca(OH)₂ के एक संतृप्त विलयन का pH, 9 है। Ca(OH)₂ की विलेयता गुणनफल (Kₛₚ) है :
(1) 0.5 × 10⁻¹⁵
(2) 0.25 x 10⁻¹⁰
(3) 0.125 × 10⁻¹⁵
(4) 0.5 × 10⁻¹⁰

Answer 1

answer : option (1) 0.5 × 10^-15

pH of saturated solution of Ca(OH)2 is 9

we know, pH + pOH = 14

so, pOH of saturated solution of Ca(OH)2 is 14- 9 = 5

hence, pOH = -log[OH-] = 5

⇒[OH-] = 10^-5

Ca = [OH-]/2 = 1/2 × 10^-5 = 0.5 × 10^-5

now dissociation reaction of Ca(OH)2 ...

Ca(OH)2 ⇔Ca²+ + 2OH-

so, Kₛₚ = [Ca²+] [OH-]²

= 0.5 × 10^-5 × (10^-5)²

= 0.5 × 10^-15

hence, option (1) is correct choice.

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