常温下,下列各溶液的叙述中正确的是
A.pH=7的醋酸钠和醋酸混合液中:c(Na+)=c(CH3COO-)
B.0.1mol/L的醋酸的pH=a,0.01mol/L的醋酸的pH=b,则a+1>b
C.0.1mol/L的醋酸钠溶液20mL与0.1mol/L盐酸10mL混合后溶液显酸性
c (CH3COO-)>c (Cl-)>c (H+)>c (CH3COOH)
D.已知酸性HF>CH3COOH,pH相等的NaF与CH3COOK溶液中, [c(Na+)-c(F一)]<[c(K+)-c(CH3COO一)]