A group of students measured the pH of some substances they found in their homes. Their results are given in the following table :
Substance - PH
Apples - 3.0
Baking soda - 8.5
Black coffee - 5.0
Household ammonia - 12.0
Lemon Juice - 2.5
Milk - 6.5
Salt - 7.0
Sugar - 7.0
Toothpaste - 9.0
Vinegar - 3.0
Washing soda - 11.5
(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 solution can be used to treat wasp stings?
(f) Which solution can be used to treat bee stings?
(a) Universal indicator 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 (acid) can be used to treat wasp stings since it injects an alkaline liquid into the skin.
(f) Baking soda can be used to treat bee stings since it injects methanoic acid into the skin.