If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.00, which of the following is TRUE?单项选择题

A

[HCHO2] < [NaCHO2]

B

[HCHO2] = [NaCHO2]

C

[HCHO2] << [NaCHO2]

D

[HCHO2] > [NaCHO2]

E

It is not possible to make a buffer of this pH from HCHO2 and NaCHO2

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