用 K 2 Cr 2 O 7 基准物质以置换碘量法标定 Na 2 S 2 O 3 溶液浓度,常以淀粉液为指示剂,其加入的适宜时间是滴定至近终点时加入,若滴定开始时加入则会发生
A.
标定结果偏高
B.
标定结果偏低
C.
对标定结果无影响
D.
指示剂不变色,无法指示滴定终点
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