Question

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

• A. (a)-(iv), (b)-(ii), (c)-(i), (d)-(ii)
• B. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
• C. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
• D. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
• E. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

Hint:

Remember common pH values: - Strong bases $\sim 10$ - Mild acids $\sim 5$ - Neutral $\sim 7$

Answer 1

Answer: (E)

Concept: Typical pH values:
• Milk of magnesia $\rightarrow$ basic ($\sim 10$)
• Black coffee $\rightarrow$ acidic ($\sim 5$)
• Egg white $\rightarrow$ slightly basic ($\sim 7.8$)
• Milk $\rightarrow$ slightly acidic ($\sim 6.8$)

Step 1: Match each substance.

• (a) Milk of magnesia $\rightarrow$ (iv)
• (b) Black coffee $\rightarrow$ (iii)
• (c) Egg white $\rightarrow$ (ii)
• (d) Milk $\rightarrow$ (i)