题目:
取0.2mol/LHX溶液与0.2mol/LNaOH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(25°C),则下列说法(或关系式)正确的是( )
A.混合溶液中由水电离出的c(OH-)=1×10-8mol/L
B.混合溶液中c(Na+)=c(X-)+c(HX)
C.混合溶液中c(Na+)-c(X-)=c(OH-)-c(H+)
D.混合溶液中c(X-)>c(Na+)>c(OH-)>c(H+)
答案:
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