Solid Be(NO3)2 is gradually dissolved in a 1.0×10−4MNa2CO3 solution. At what concentration of Ba2+ will a percipitate begin to form? (KSP for BaCO3=5×10−9).
8.1×10−8M
5.1×10−5M
4.1×10−5M
8.1×10−7M
A
8.1×10−8M
B
8.1×10−7M
C
5.1×10−5M
D
4.1×10−5M
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Solution
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Na2CO3⟶2Na++CO2−3
1×10−4M
BaCO3⟶Ba2++CO2−3
ksp=[Ba2+][CO2−3]
5×10−9=[Ba2+][1×10−4]
[Ba2+]=5×10−91×10−4
=5.1×10−5
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