已知:T℃时,Ksp(CaSO
4)=4.90×10
-5、Ksp (CaCO
3)=2.8×10
-9 Ksp(PbCO
3)=8.4×10
-14 , 三种盐的沉淀溶解平衡曲线如图所示,pM=-lgc(阴离子)、pN=-lgc(阳离子)。下列说法错误的是( )
![](http://tikupic.21cnjy.com/7c/c6/7cc6cc80e376ded02ea49ec82e777f2e.png)
- A、a线是CaSO4沉定溶解平衡曲线
- B、T℃时,向10mL水中加入CaCO3和PbCO3至二者均饱和,溶液中c(Ca2+)∶c(Pb2+)=
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsub%3E%3Cmi%3EK%3C%2Fmi%3E%3Cmrow%3E%3Cmi%3Es%3C%2Fmi%3E%3Cmi%3Ep%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmrow%3E%3Cmi%3EC%3C%2Fmi%3E%3Cmi%3Ea%3C%2Fmi%3E%3Cmi%3EC%3C%2Fmi%3E%3Cmsub%3E%3Cmi%3EO%3C%2Fmi%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmsub%3E%3Cmi%3EK%3C%2Fmi%3E%3Cmrow%3E%3Cmi%3Es%3C%2Fmi%3E%3Cmi%3Ep%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmrow%3E%3Cmi%3EP%3C%2Fmi%3E%3Cmi%3Eb%3C%2Fmi%3E%3Cmi%3EC%3C%2Fmi%3E%3Cmsub%3E%3Cmi%3EO%3C%2Fmi%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
- C、d点表示CaCO3的饱和溶液。且c(Ca2+)<c(CO32-)
- D、T℃时,向CaSO4沉淀中加入1mol·L-1的Na2CO3溶液,CaSO4沉淀会转化为CaCO3沉淀