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Acids, Bases and Salts

Gujarat Board · Class 10 · Science

Quick revision notes for Acids, Bases and Salts — Gujarat Board Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.

59 questions26 flashcards5 concepts

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An infographic showing common acid-base indicators (litmus, phenolphthalein, methyl orange, turmeric, red cabbage) and the distinct color changes they exhibit in acidic, neutral, and basic solutions.
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Key Topics to Revise

1

Indicators — Testing Acids and Bases

  • An indicator is a substance that shows different colours in acidic and basic solutions.
  • Litmus is a natural indicator extracted from lichen (a plant of division Thallophyta). It is purple when neutral, turns red in acids, and turns blue in bases.
  • Phenolphthalein is colourless in acidic solutions and pink/magenta in basic solutions.
2

Chemical Properties of Acids and Bases

  • Acid + Metal → Salt + Hydrogen gas (H₂). Example: H₂SO₄ + Zn → ZnSO₄ + H₂↑
  • The hydrogen gas produced burns with a 'pop' sound when a burning candle is brought near it — this is the test for hydrogen gas.
  • Not all metals react with bases, but zinc reacts with NaOH: 2NaOH + Zn → Na₂ZnO₂ (sodium zincate) + H₂↑
3

Acids and Bases in Water — Ions and Conductivity

  • All acids produce H⁺ ions (or H₃O⁺ ions / hydronium ions) when dissolved in water. This is responsible for their acidic properties.
  • All bases produce OH⁻ ions when dissolved in water. This is responsible for their basic properties.
  • Bases which are soluble in water are called alkalis. Example: NaOH, KOH, Ca(OH)₂.
4

pH Scale — Measuring Acid and Base Strength

  • pH stands for 'potenz' (German word for power). It is a scale used to measure the concentration of hydrogen ions in a solution.
  • pH scale ranges from 0 to 14.
  • pH = 7 → Neutral solution (pure water at 25°C).

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Full Notes

Key Concepts

Indicators are dyes or mixturesWhen acids react with metalsMetal carbonates and metal hydrogencarbonates reactNeutralisation is the reaction betweenAll acids produce hydrogen ions (H⁺)

Frequently Asked Questions

What are the important topics in Acids, Bases and Salts for Gujarat Board Class 10 Science?
Key topics in Acids, Bases and Salts include Acids, Bases and Salts — Complete Chapter Overview, Acids, Bases and Salts – Complete Chapter Overview, Acids, Bases and Salts - Concept Overview. These are the concepts Gujarat Board Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Acids, Bases and Salts — Gujarat Board Class 10 Science?
Understand the core concepts first, then work through the 59 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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