作者FireHell (冥煌 = 好硬)
看板NTUAC95
标题[问题] 关於这几题化学题目~~~请高人指点
时间Sat Apr 14 00:02:43 2007
1.
The common-ion effect refers to the observation __________.
Correct Answer:
that the selective precipitation of a metal ion, such as Ag+, is promoted by
the addition of an appropriate counterion (X-) that produces a compound (AgX)
with a very low solubility
2.
A solution of HF is titrated with a 0.150 M NaOH solution. Based on the table
above, the best indicator for this reaction is __________. The Ka of
hydrofluoric acid is 6.8 X 10^-4.
Correct Answer:
methyl red
3.
A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.27M KOH solution. The
H3O+ concentration after the addition of 80.0mL of KOH is __________ M.
Correct Answer:
3.6 X 10^-2
都是线上习题的，不知道为什麽，烦请大大指点迷津~~~orz
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