![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
常温下,取0.2 mol•L-1 HX溶液与0.2 mol•L-1 NaOH溶液等体积混合(忽略混合后溶液体积的变化),测得混合溶液的pH=8,则下列关于混合溶液的说法(或关系式)正确的是()
A.(Na+)-c(X-)=9.9×10-7 mol•L-1
B.(Na+)=c(X-)+c(HX)=0.2 mol•L-1
C.(OH-)-c(HX)=c(H+)=1×10-6 mol•L-1
D.(Na+)>c(X-)>c(HX)>c(OH-)>c(H+)
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
A、(Na+)-c(X-)=9.9×10-7 mol•L-1
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)