NaH
2PO
4、Na
2HPO
4是新型冠状病毒灭活疫苗的辅料之一。298K时,向H
3PO
4溶液中逐滴加入NaOH溶液至过量,所得溶液中H
3PO
4、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EH%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmath%3E)
、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmtext%3EH%3C%2Fmtext%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E2%3C%2Fmtext%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmath%3E)
、
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E3%3C%2Fmtext%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmath%3E)
的物质的量分数δ(X)随溶液pH的变化如图所示[δ(X)=
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3EX%3C%2Fmtext%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmrow%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EH%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E3%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmtext%3E%2B%3C%2Fmtext%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmrow%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EH%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E2%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmtext%3E%2B%3C%2Fmtext%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3EH%3C%2Fmtext%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E2%3C%2Fmtext%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3Cmtext%3E%2B%3C%2Fmtext%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3EP%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E4%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E3%3C%2Fmtext%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
]。下列叙述正确的是(已知:lg2=0.3)
![](http://tikupic.21cnjy.com/2023/04/25/a1/04/a1049b26a0740fd616c4a94784f20770_353x200.png)
- A、使δ(
)增加的离子方程式:H3PO4+2OH-=
+2H2O - B、b点溶液中:c(Na+)<3c(
)+3c(
) - C、c点溶液中由水电离出的c(H+)为10-12.7
- D、若NaH2PO4和Na2HPO4组成的混合溶液pH=6,则溶液中:c(
)=400c(H3PO4)