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Question
Equal volume of the following Ca2+ and F− solutions are mixed. In which solutions will the precipitation occur?
Ksp of CaF2=1.7×10−10
(1) 10−2MCa2++10−5MF−
(2) 10−3MCa2++10−3MF−
(3) 10−4MCa2++10−2MF−
(4) 10−2MCa2++10−3MF−
Select the correct answer using the codes given below:
Equal volume of the following Ca2+ and F− solutions are mixed. In which solutions will the precipitation occur?
Ksp of CaF2=1.7×10−10
(1) 10−2MCa2++10−5MF−
(2) 10−3MCa2++10−3MF−
(3) 10−4MCa2++10−2MF−
(4) 10−2MCa2++10−3MF−
Select the correct answer using the codes given below:
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Solution
The correct option is D In (2), (3) and (4)
Precipitation of salt will occur when Ksp<[Ca2+][F−]2.(1) 10−2MCa2++10−5MF− Check whether Ksp<[Ca2+][F−]2 1.7×10−10>[10−2][10−5]2=10−12So precipitation of salt will not occur.
(2) 10−3MCa2++10−3MF− Check whether Ksp<[Ca2+][F−]2 1.7×10−10>[10−2][10−5]2=10−12So precipitation of salt will not occur.(3) 10−4MCa2++10−2MF−
Check whether Ksp<[Ca2+][F−]2 1.7×10−10<[10−3][10−3]2=10−9So precipitation of salt will occur.(4) 10−2MCa2++10−3MF−
Check whether Ksp<[Ca2+][F−]2 1.7×10−10>[10−2][10−3]2=10−8So precipitation of salt will occur.
Precipitation of salt will occur when Ksp<[Ca2+][F−]2.
(1) 10−2MCa2++10−5MF−
Check whether Ksp<[Ca2+][F−]2
1.7×10−10>[10−2][10−5]2=10−12
So precipitation of salt will not occur.
(2) 10−3MCa2++10−3MF−
(2) 10−3MCa2++10−3MF−
Check whether Ksp<[Ca2+][F−]2
1.7×10−10>[10−2][10−5]2=10−12
So precipitation of salt will not occur.
(3) 10−4MCa2++10−2MF− Check whether Ksp<[Ca2+][F−]2
1.7×10−10<[10−3][10−3]2=10−9
So precipitation of salt will occur.
(4) 10−2MCa2++10−3MF−
Check whether Ksp<[Ca2+][F−]2
1.7×10−10>[10−2][10−3]2=10−8
So precipitation of salt will occur.
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