Year 9 Homework – Acids and Bases
Questions on Acids and Bases
Name: ________________________
Due Date : _____________________
1. What is the taste of most acids?
_____________________________________________________________________________
2. Give 3 natural sources of acids.
_____________________________________________________________________________
3. What is the acid formed when carbon dioxide is dissolved in water? Where can you find this
acid?
_____________________________________________________________________________
4. What happens when a metal like magnesium is placed in a test tube of acid? Which gas is
produced?
_____________________________________________________________________________
_____________________________________________________________________________
5. Why do acids dangerous?
_____________________________________________________________________________
_____________________________________________________________________________
6. All acids contain ______________ that will be released in solution to give the acidic properties.
7. Name the acids found in food and drinks.
_________________________, __________________________, ______________________,
_________________________, __________________________, ______________________,
8. Name a strong acid: ______________________ and a weak acid: ______________________.
9. What are alkalis?
_____________________________________________________________________________
10. What should you do when you have a spillage of acid or alkali on your skin?
_____________________________________________________________________________
11. Name 4 common bases at home and give their uses.
______________________
___________________________________________________
______________________
___________________________________________________
______________________
___________________________________________________
______________________
___________________________________________________
12. What is the meaning of neutralisation?
_____________________________________________________________________________
_____________________________________________________________________________
13. Why do we use toothpaste for cleaning teeth?
_____________________________________________________________________________
_____________________________________________________________________________
14. Which acid is found in our stomach? Which chemical can be taken to neutralise excess acid in
the stomach?
_____________________________________________________________________________
_____________________________________________________________________________
15. Hydrangea appears in different colour in different soil.
Why?
_____________________________________________
_____________________________________________
16. What is an “Indicator”?
_____________________________________________
_____________________________________________
17. Give 3 natural indicators.
_____________________________________________________________________________
18. Litmus paper is used to test for acid or base.
Blue litmus  Red
indicates the solution is ________________(acidic/alkali)
Red litmus  Blue
indicates the solution is ________________(acidic/alkali)
19. If a solution does not change the colour of the red litmus, what can you tell about this solution?
_____________________________________________________________________________
20. Why is pH paper a better choice than litmus paper?
_____________________________________________________________________________
_____________________________________________________________________________
21. What is the difference between a pH 1 and pH 5? Which pH stands for “Neutral”?
___________________________________________________________________________