AP* Solubility Equilibrium Free Response Questions
page 1
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1985
At 25
°
C the solubility product constant,
K
sp
, for strontium sulfate, SrSO
4
, is 7.6
×
10
−
7
. The solubility product
constant for strontium fluoride, SrF
2
, is 7.9
×
10
−
10
.
(a)
What is the molar solubility of SrSO
4
in pure water at 25
°
C?
(b) What is the molar solubility of SrF
2
in pure water at 25
°
C?
(c) An aqueous solution of Sr(NO
3
)
2
is added slowly to 1.0 liter of a well-stirred solution containing
0.020 mole F
−
and 0.10 mole SO
4
2
−
at 25
°
C. (You may assume that the added Sr(NO
3
)
2
solution does not
materially affect the total volume of the system.)
1. Which salt precipitates first?
2. What is the concentration of strontium ion, Sr
2+
, in the solution when the first precipitate begins
to form?
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- STARNES
- Chemistry, Equilibrium, Solubility, Solubility equilibrium
