Discussion
Match the correct pH value with the following substances:
| (a) Milk of magnesia | (i) pH = 6.8 |
| (b) Black coffee | (ii) pH = 7.8 |
| ( c) Egg white | (iii) pH = 5 |
| (d) Milk | (iv) pH = 10 |
Answer: E
The correct match is (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).
- Milk of magnesia, a suspension of magnesium hydroxide, is basic: pH about 10.
- Black coffee is mildly acidic: pH about 5.
- Egg white is slightly basic: pH about 7.8.
- Milk is very slightly acidic: pH about 6.8.
Options matching coffee to 7.8 or milk of magnesia to 6.8 put an acidic substance on the basic side or the other way round; option A also uses (ii) twice.
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