Acids, Bases and Salts Question 1
- Calcium sulphate can be formed by the reaction between calcium carbonate and solution X. Two other substances are produced in this reaction.
- Name solution X. [1]
- Name the other two products. [2]
- Name the type of reaction that occur between calcium carbonate and X. [1]
- To prepare a sample of calcium sulphate, excess calcium carbonate has to be added to solution X.
Explain why calcium carbonate should be in excess. [1]
- Name the process that is used to separate the excess calcium carbonate from calcium sulphate solution. [1]
- The strength of an acid or a base can be determined using the pH scale.
- State the range of the pH scale. [1]
- What is the pH value of a neutral substance. [1]
- List two properties of alkaline substance. [2]
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Solution 1
- Solution X is sulphuric acid.
because the salt formed is a sulphate.
- Carbon dioxide and Water
(When carbonates react with acids, the products are salt, carbon dioxide and water)
- Neutralisation.
Every reaction between an acid and a base (or alkali) or an acid and a carbonate is called a neutralisation reaction.
- Calcium carbonate should be in excess in order to make sure that all acid has reacted.
- Filtration.
because the excess calcium carbonate is insoluble once the reaction is finished
- Solution X is sulphuric acid.
- The strength of an acid or a base can be determined using the pH scale.
- 0 to 14
- 7
the pH scale is a measurement the acidity or alkaline of a substance based on a scale of 0 to 14. Acids have a pH value less than 7, bases and alkalis have a pH value greater than 7 and neutral substances have a pH of 7.
- They turn litmus paper blue
- They neutralise acids to produce a salt and water.
Metal oxides are bases and soluble bases are called alkalis (alkaline substances). So the chemical properties of bases and alkalis are the same.
