Acids and bases Summary - Lesmahagow High School

Lesmahagow High School Science Department
Acids and Bases : Summary Exercise Answers
Answer the questions in your jotter.
1. What is the pH scale?
acid or base is
The pH number of a substance is linked to how concentrated an
2. What methods can be used to measure the pH number? Universal indicator or pH paper
3. What pH numbers are acids? pH 1-6
4. What pH numbers are bases? pH 8-14
5. What pH does a neutral solution have? pH 7
6. What is a hazard? something that can cause you danger
7. Acids and bases are both corrosive. What does this mean? A substance that burns through
8. When universal indicator is added to a base which colour(s) will it turn? Purple/blue/dark
9. When universal indicator is added to an acid which colour(s) will it turn?
Red/orange/yellow/light green
10. Which pH is the most concentrated acid?
A. pH 1
B. pH 3
C. pH 5
D.pH 6
11. Name a household acid Vinegar/tomato sauce/lemon juice (anything reasonable)
12. Name a household base toothpaste/dishwasher powder/bicarbonate of soda (anything
13. Name a laboratory acid hydrochloric/nitric/sulphuric
14. Name a laboratory base sodium hydroxide/ammonia
15. An alkali is a special type of base. What is special about it? It dissolves in water
16. Acetic acid is a weak acid and has a pH value of 5. Suplhuric acid is a strong acid. Predit the pH
value of sulphuric acid. A number less than 5