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CGB IGCSE Chemistry
Practice Problems Acids and Bases
Tips and Hints
Practice Problems
Answers to Practice Problems

Acids and Alkalis
1.  What does corrosive mean?
2.  How would you test a substance, to see if it is an acid?
3.  Write down the formula for:
   sulphuric acid
   calcium  hydroxide
   nitric acid
   ammonia solution
4.  What effect do alkalis have on litmus solution?
5.  Say whether a solution is acidic, alkaline or neutral, if its pH number is:
     9    4    7    1    10    3
6.  What color would universal indicator show, in an aqueous solution of sugar?  Why?
  1. Name the acid found in:

Lemon juice      wine     ice tea  vinegar


  1. Write a word equation for the reaction of dilute sulphuric acid with :
    1. Zinc
    2. Magnesium oxide
    3. Sodium carbonate


  1. Bath salts contain sodium carbonate.  Explain why they fizz when you put vinegar on them.


  1. What causes the acidity in acids?


  1. Why is ethanoic acid called a weak acid?


  1. Name two other weak acids, and two strong acids.


  1. Which ion do alkalis all have in common?


  1. What color would litmus solution turn, if you mixed it with ajax?  Why?


  1. A 10% solution of potassium hydroxide has a higher pH number than a 10% solution of ammonia.  Why is this?  Which one will be a better conductor of electricity.


  1. Write a word equation for the reaction between sodium hydroxide and ammonium chloride.


  1. What happens to:


    1. The H+ ions
    2. The temperature

Of the solution when an acid is neutralized.


  1. Write a balanced equation for the reaction between sodium hydroxide and
    1. Sulphuric acid
    2. Nitric acid


  1. What is a base?  Name six bases.


  1. What special property do alkalis have?


  1. Which bases react with acids to give carbon dioxide?


  1. Write a word equation for the reaction between:

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