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【单选题】
有一磷酸盐溶液,可能由 Na 3 PO 4 、 Na 2 HPO 4 、 NaH 2 PO 4 或其中二者的混合物组成,今以百里酚酞为指示剂,用盐酸标准滴定溶液滴定至终点时消耗 V1mL ,再加入甲基红指示剂,继续用盐酸标准滴定溶液滴定至终点时又消耗 V 2 mL 。当 V 2 > V 1 , V 1 > 0 时,溶液的组成为()。
A.
Na 2 HPO 4 + NaH 2 PO 4
B.
Na 3 PO 4 + Na 2 HPO 4
C.
Na 2 HPO 4
D.
Na 3 PO 4 ＋ NaH 2 PO 4
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