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【单选题】
配制pH=5的缓冲溶液,用下列哪对缓冲对()A.
NaH 2 PO 4 -Na 2 HPO 4 (K a2 ѳ =6.3×10 -8 )
B.
HAc-NaAc(K a ѳ =1.76×10 -5 )
C.
NaHCO 3 -Na 2 CO 3 (K a2 ѳ =5.6×10 -11 )
D.
NH 4 Cl-NH 3 (K b ѳ =1.74×10 -5 )
E.
H 2 CO 3 -NaHCO 3 (K a1 ѳ =4.17×10 -7 )
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