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The precipitate of
CaF2(Ksp = 1.7 × 10–10)
is obtained when equal volumes of the following are mixed
  • a)
    10–4M Ca2+ + 10–4M F
  • b)
    10–2M Ca2+ + 10–3M F
  • c)
    10–5M Ca2+ + 10–3M F–
  • d)
    10–3M Ca2+ + 10–5M F
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The precipitate ofCaF2(Ksp = 1.7 × 10–10)is obtained when ...
TIPS/Formulae :
For precipitation to occur ionic product > solubility products

Ionic product of C aF2 = [Ca2+] [F-]2 Calculate I.P. in each case
(a) I.P. of CaF2 = (10–4) × (10–4)2  = 10–12
(b) I.P. of CaF2 = (10–2) × (10–3)2  = 10–8
(c) I.P. of CaF2  =  (10–5) × (10–3)2  = 10–11
(d) I.P. of CaF2 =  (10–3) × (10–5)2  = 10–13
∵ I.P > solubility in choice (b) only..
∴ ppt of CaF2 is obtained in case of choice (b) only..
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The precipitate ofCaF2(Ksp = 1.7 × 10–10)is obtained when equal volumes of the following are mixeda)10–4M Ca2+ + 10–4M F–b)10–2M Ca2+ + 10–3M F–c)10–5M Ca2+ + 10–3M F–d)10–3M Ca2+ + 10–5M F–Correct answer is option 'B'. Can you explain this answer?
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