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]
Given the following indicators and their behaviour t.4k ;nexm i3,wfsn n5s, w fyp)+w3x vf6zcp8sh3l a ivy s .td7:5hat will be the correct colours of a solution of 1. hv l5:z8c.y+sdapxfvti)633f sp7y w 0 M KOH tested with each indicator?
| Indicator | pH range | Colour change (Acid- alkali) | | Methyl orange | 3.1- 4.4 | Red – Orange | | Bromocresol green |
3.8 - 5.4 | Yellow - Blue | | Phenolphthalein | 8.3 - 10.0 | Colourless - Pink |
A. Methyl orange is Red Bromocresol green is Yellow Phenolphthalein is Colourless
B. Methyl orange is Orange Bromocresol green is Blue Phenolphthalein is Pink
C. Methyl orange is Orange Bromocresol green is Blue Phenolphthalein is Colourless
D. Methyl orange is Orange Bromocresol green is Yellow Phenolphthalein is Pink
参考答案: B
本题详细解析:
A 1.0M solution of KOH would ha*pfvk4ry wz* -9j he /,jmv-qpve a pH of 14. Methyl orange, bromocresol green, az*v-kpvr* , y p-e jw9jmf4hq/nd phenolphthalein would be orange, yellow, and green respectively at this pH.
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