只含Na 2 CO 3 溶液,先用HCl滴定至酚酞变色,耗去V 1 ml,继续以甲基橙为指示剂,耗去V 2 ml,则 V 1 和V 2 的关系是( )
A.
V 1 =V 2
B.
V 1 >V 2
C.
V 1 2
D.
不确定
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