What is a Universal Indicator? Universal Indicator is a chemical used to measure the acidity or alkalinity of a substance. A universal indicator is basically a pH indicator. It is a mixture of several compounds that exhibits several smooth colour changes over a wide range of pH values. pH is Read more…
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 A red B green C purple i. State the function of the universal indicator solution. [1] ii. Deduce the nature of Read more…
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. Read more…
Acids Bases and Salts Questions and Answers (O level Chemistry) Question 1 Acids are neutralised by alkalis. Write the ionic equation for the reaction between an acid and an alkali. Sodium sulphate is a soluble salt that can be prepared using a titration method.(i) Name a sodium compound and an Read more…
Preparation of Salts (O level Chemistry) Preparation of salts depends on the physical and chemical properties of the salt. For example, when choosing the best method to prepare a salt you need to consider the following: is the salt soluble? If yes, we usually prepare it by neutralisation of acid Read more…