谷氨酸[ HOOC(CH
2)
2CH(NH
2)COOH,用H
2R表示]是人体内的基本氨基酸之一,在水溶液中存在如下平衡:H
2R
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmover%3E%3Cmo%3E%E2%87%8C%3C%2Fmo%3E%3Cmrow%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EK%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E1%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmover%3E%3C%2Fmath%3E)
HR
-![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmover%3E%3Cmo%3E%E2%87%8C%3C%2Fmo%3E%3Cmrow%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EK%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmover%3E%3C%2Fmath%3E)
R
2-。常温下,向一定浓度的H
2R溶液中滴加NaOH溶液,混合溶液中lgx[x表示
![](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%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%3ER%3C%2Fmtext%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3EH%3C%2Fmtext%3E%3Cmsup%3E%3Cmrow%3E%3Cmtext%3ER%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
或
![](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%3EH%3C%2Fmtext%3E%3Cmsup%3E%3Cmrow%3E%3Cmtext%3ER%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3Ec%3C%2Fmtext%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmsup%3E%3Cmrow%3E%3Cmsup%3E%3Cmrow%3E%3Cmtext%3ER%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
]随pOH[pOH=- lgc(OH
- )] 的变化如图所示。下列说法正确的是( )
![](http://tikupic.21cnjy.com/2024/01/16/7c/7c/7c7cb26c9f290566917fdea863de0145_267x192.jpg)
- A、K1=1×10-9.7
- B、pH=7时,c(HR-)>c(H2R)>c(R2-)
- C、曲线II表示pOH与lg
的变化关系 - D、M点时,c(H+ )+c(Na+ )=c(OH-)+3c(HR-)