CaCO3CaC2O4y[Ca2+]x(x+y)y(x+y)→Ca2++CO32−→Ca2++C2O42−=x+y=4.7×10−9=1.3×10−9 yx=3.6∴x=3.6yy(3.6y+y)=1.3×10−9y=1.6×10−5[Ca2+]=(x+y)=(1.6×10−5)+(5.76×10−5)=7.46×10−5M
The value of Ksp of CaCO3 and CaC2O4 are 4.7×10−9 and 1.3×10−9 respectively at 25∘C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water?
Held on 30 Apr 2013 · Verified 9 Jul 2026.
5.831×10−5M
6.856×10−5M
3.606×10−5M
7.746×10−5M
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