Class 10 Science - KERALA
Acids, Bases and Salts
The Chapter 'Acids, Bases and Salts' in Class 10 Kerala SCERT Science explores the chemical properties of substances and their classification. Students learn about indicators to identify acids and bases, their reactions with metals, metal oxides, and non-metal oxides, and the concept of the pH scale to measure hydrogen ion concentration. The chapter also details the preparation, properties, and uses of important chemical compounds like sodium hydroxide, bleaching powder, baking soda, washing soda, and plaster of Paris. This chapter is vital for board exams as it tests both conceptual understanding and chemical equation balancing.
Start Learning FreeKey Concepts
Indicators
Substances that change color in acidic or basic solutions, used to test whether a given substance is an acid or a base.
Neutralisation Reaction
The reaction between an acid and a base to give salt and water, which forms the basis of many chemical processes.
pH Scale
A numerical scale ranging from 0 to 14 used to measure the hydrogen ion concentration in a solution, indicating acidity or basicity.
Water of Crystallisation
The fixed number of water molecules present in one formula unit of a salt, such as copper sulfate pentahydrate.
Chlor-alkali Process
The electrolysis of an aqueous solution of sodium chloride (brine) that produces sodium hydroxide, chlorine gas, and hydrogen gas.
Important Formulas
Board Exam Info
In the Kerala SSLC (SCERT) Science examination, this chapter typically carries around 6 to 8 marks. Questions frequently include identifying products of chemical reactions, balancing equations, explaining the chlor-alkali process, solving pH-related conceptual questions, and uses of salts like baking soda and plaster of Paris.
Frequently Asked Questions
Why does a dry hydrochloric acid gas not change the color of dry litmus paper?
Dry HCl gas does not dissociate to form hydrogen ions (H+) in the absence of water. Ions are required to show acidic properties and change the color of the indicator.
Why should sour curd and substances not be kept in brass and copper vessels?
Curd and sour substances contain acids. These acids react with brass and copper metals to form toxic soluble salts, which can cause food poisoning.
What happens when electricity is passed through an aqueous solution of sodium chloride?
It decomposes to form sodium hydroxide, chlorine gas, and hydrogen gas. This process is known as the chlor-alkali process.
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