Topics
Chemical Substances-Nature and Behaviour
Chemical Reactions and Equations
- Chemical Reaction
- Characteristics of Chemical Reactions
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- Types of Chemical Reactions > Decomposition Reaction
- Types of Chemical Reactions > Single Displacement Reaction
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World of Living
Acids, Bases and Salts
- Introduction to Acids, Bases and Indicators
- Indicators for Testing Acids and Bases
- Acids
- Properties of Acids
- Common Properties of Acids
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- Bases
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- Common Properties of Acids and Bases
- Strength of Acid and Base Solutions : pH Scale
- Universal Indicator
- Importance of pH in Everyday Life
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- Salts > Family of Salts
- Salts > pH of Salts
- Common Salt
- Sodium hydroxide
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- Water of Crystallisation: Hydrated Salts
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Notes
PRODUCTION of NaOH:-
When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. The process is called the chlor-alkali process because of the products formed chlor for chlorine and alkali for sodium hydroxide.
2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(g) + H2(g)
Chlorine gas is given off at the anode, and hydrogen gas at the cathode. Sodium hydroxide solution is formed near the cathode. The three products produced in this process are all useful.
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