Acids, Bases and Salts Question 2

The table below shows the effect of three substances A, B and C on universal indicator solution.

substanceeffect on universal indicator solution
Ared
Bgreen
Cpurple
  1. i. State the function of the universal indicator solution. [1]

    ii. Deduce the nature of substances A, B and C. [3]

  2. Dilute hydrochloric acid is reacted with magnesium carbonate.

    i. State the type of reaction. [1]

    ii. Write a word equation for the reaction. [2]

  3. Name the acid and the alkali that react to produce potassium chloride solution. [2]
  4. Suggest how the solution of potassium chloride could be tested to make sure that it does not contain excess acid or alkali. [2]
  5. Name the two products formed when an acid reacts with a base. [2]
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Solution 2

  1. i. To measure the acidity or alkalinity of a substance.

    ii. A is acidic, B is neutral and C is alkaline (or basic)

  2. 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)

  3. Potassium hydroxide (alkali) and hydrochloric acid.
  4. Add universal indicator to the salt, if it doesn’t contain excess acid or excess alkali the universal indicator turns green.
  5. Salt and water.

Sydney Chako

Mathematics, Chemistry and Physics teacher at Sytech Learning Academy. From Junior Secondary School to Tertiary Level Engineering Mathematics and Engineering Science.

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