Acids, Bases and Salts Question 2
The table below shows the effect of three substances A, B and C on universal indicator solution.
|substance||effect on universal indicator solution|
- i. State the function of the universal indicator solution. 
ii. Deduce the nature of substances A, B and C. 
- Dilute hydrochloric acid is reacted with magnesium carbonate.
i. State the type of reaction. 
ii. Write a word equation for the reaction. 
- Name the acid and the alkali that react to produce potassium chloride solution. 
- Suggest how the solution of potassium chloride could be tested to make sure that it does not contain excess acid or alkali. 
- Name the two products formed when an acid reacts with a base. 
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- i. To measure the acidity or alkalinity of a substance.
ii. A is acidic, B is neutral and C is alkaline (or basic)
- i. Neutralisation.
Every reaction between an acid and a base (or alkali) or an acid and a carbonate is called a neutralisation reaction.
ii. Hydrochloric acid + magnesium carbonate → magnesium chloride + carbon dioxide + water
(When carbonates react with acids, the products are salt, carbon dioxide and water)
- Potassium hydroxide (alkali) and hydrochloric acid.
- Add universal indicator to the salt, if it doesn’t contain excess acid or excess alkali the universal indicator turns green.
- Salt and water.