本题目来源于试卷: Mechanisms of Chemical Change F.1 Proton Transfer Reactions，类别为 IB化学
[单选题]
Which indicator would be most suitable for a titration between sodium hydroxi x2jjxx v8;.jnhvr 0stgb.l :+de jvrvhsnx.:+ xb8 ;l txjj.0 g2r 49wzplhu9tf: 1xzm 7and ethan 49:r f7l hz1ztmu9pwx oic acid?
| Indicator | pKa | | Methyl orange | 3.7 | | Bromocresol green | 4.7 | | Bromothymol blue | 7.0 | | Phenolphthalein | 9.6 |
A. Methyl orange
B. Bromocresol green
C. Bromothymol blue
D. Phenolphthalein
参考答案: D
本题详细解析:
Ethanoic acid is a weak acid and sodium hydroxide is a stronr63pug) qjgw,r 5nc;sg base. At the equivalence point, pH>7, therefore the indicator chosen must have an end sg)jp c urn6qrw,53;gpoint>7(as determined by its $(pK_a)$.
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