31. If the pKa of HCHO₂ is 3.74 and the pH of an HCHO₂/NaCHO₂ solution is 3.89, which of the following is TRUE?
(A) [HCHO₂] ＜ [NaCHO₂]
(B) [HCHO₂] = [NaCHO₂]
(C) [HCHO₂] ＞ [NaCHO₂]
(D) [HCHO₂] ＞＞ [NaCHO₂]

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