Question

Substance	pH	Substance	pH
Apples	3.0	Salt	7.0
Baking soda	8.5	Sugar	7.0
Black coffee	5.0	Toothpaste	9.0
Household ammonia	12.0	Vinegar	3.0
Lemon juice	2.5	Washing soda	11.5
Milk	6.5

A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:

(a) What would the students have used to measure the pH?

(b) Which solution is the most acidic?

(c) Which solution is the most alkaline?

(d) Which solutions are neutral?

(e) Which solutions can be used to treat wasp stings?

(f) Which solutions can be used to treat bee stings?

Answer 1

(a) Universal indicator paper, pH paper, is used to measure the pH.

(b) Lemon juice with pH = 2.5 is the most acidic.

(c) Household ammonia with pH = 12 is the most alkaline.

(d) Salt solution and sugar solution with pH = 7 are neutral.

(e) Vinegar and Lemon juice can be used to treat wasp stings since wasp stings are alkaline in nature.

(f) Baking soda and household ammonia can be used to treat bee stings since bee injects methanoic acid into the skin.