The list shows three substances and their chemical natures.

Question

Substance Chemical Nature
milk of magnesia basic
distilled water neutral
lemon juice acidic


Which of the following correctly lists the substances from highest to lowest pH?
A.

lemon juice, distilled water, milk of magnesia
B.

distilled water, milk of magnesia, lemon juice
C.

lemon juice, milk of magnesia, distilled water
D.

milk of magnesia, distilled water, lemon juice

Answer 1

To rank the substances from highest to lowest pH, we need to consider their chemical natures:

• Milk of magnesia: basic (high pH)
• Distilled water: neutral (around pH 7)
• Lemon juice: acidic (low pH)

Based on this information, the ranking from highest to lowest pH should be:

1. Milk of magnesia (basic)
2. Distilled water (neutral)
3. Lemon juice (acidic)

So the correct answer is:

D. milk of magnesia, distilled water, lemon juice.