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【单选题】
物质的量浓度相等的CH 3 COOH和CH 3 COONa溶液等体积混合，下列关系式中正确的是 [ ]A.
c (Na + )=2c(CH 3 COO - )+2c(CH 3 COOH)
B.
c(H + )=c(CH 3 COO - )+c(OH - )
C.
c (Na + ) $amp;>amp;$nbsp;c (CH 3 COO - )>c(OH - )>c(H + )
D.
c(CH 3 COO - ) +2c(OH - ) = 2c(H + ) + c(CH 3 COOH)
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