Class 10 Science - ICSE-CHEMISTRY
Acids, Bases and Salts
The chapter 'Acids, Bases and Salts' in Class 10 ICSE Chemistry explores the fundamental chemical properties of these three major classes of compounds. Students will learn the Arrhenius definition of acids and bases, the concept of pH, and how different types of salts are prepared. The chapter covers crucial laboratory processes like neutralization, dilution, and the action of acids on metals, carbonates, and sulphites. This is a high-weightage topic for the ICSE board exams, frequently featuring equation-balancing questions, observation-based inquiries on colour changes of indicators, and descriptive problems on salt preparation methods.
Start Learning FreeKey Concepts
Arrhenius Theory of Acids and Bases
Acids are substances that dissociate in water to yield hydrogen ions (H+), while bases yield hydroxyl ions (OH-) as the only negatively charged ions.
Basicity of Acids
Basicity refers to the number of hydronium ions (H3O+) produced by one molecule of an acid in aqueous solution, such as 1 for HCl and 2 for H2SO4.
pH Scale
A logarithmic scale from 0 to 14 used to measure the hydrogen ion concentration in a solution, where values below 7 are acidic, 7 is neutral, and above 7 are basic.
Types of Salts
Salts are classified based on their preparation and ionic composition into normal salts, acid salts, basic salts, double salts, and complex salts.
Action of Dilute Acids on Carbonates and Bicarbonates
Dilute acids react with metallic carbonates and bicarbonates to liberate carbon dioxide gas, which turns lime water milky due to the formation of insoluble calcium carbonate.
Important Formulas
Board Exam Info
In the ICSE Chemistry (Science Paper 2) examination, this chapter typically carries around 8 to 12 marks. Questions frequently appear as balanced chemical equations, identification of unknown gases, observation-based questions involving indicators, and specific methods for preparing soluble and insoluble salts.
Frequently Asked Questions
Why does dry HCl gas not change the colour of dry litmus paper?
Dry HCl gas does not produce hydrogen ions (H+) in the absence of water. Ions are required to exhibit acidic properties and affect indicators.
What is the difference between a strong acid and a concentrated acid?
A strong acid undergoes almost complete dissociation in aqueous solution regardless of its amount. A concentrated acid simply has a high amount of solute dissolved in a minimal volume of water.
How do you distinguish between normal salts and acid salts?
Normal salts are formed by the complete replacement of ionizable hydrogen atoms of an acid by a basic radical, whereas acid salts are formed by the partial replacement of these hydrogen atoms.
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