Schooling · Class 10 · Science · Acids, Bases and Salts · Chapter on a page
CBSE Class 10 · Science · NCERT Science
Acids, Bases and Salts: chapter on a page
A cut of Shishya's notes for this chapter: the first paragraph of the introduction and the key ideas, formulas and facts, common mistakes and quick revision lists, word for word. Nothing is added or reworded; the worked examples are left out (they are on the chapter page).
About the notes: Written by Shishya's AI on 26 Sept 2026 from the chapter's title and class level, in Shishya's own words — not a copy or summary of the textbook. Read the official chapter for the book's own text, activities and exercises.
This note's current text has no applied fact-check on record.
Mind map
Drawn from the same notes by a fixed rule (no AI): each label is the item's own words — its bold term, its label before a colon, a short formula as written, or its first words.
The mind map as a list
- Key ideas
- Acids are substances that produce…
- Indicators like litmus…
- Acids react with metals to produce…
- Neutralisation is the reaction…
- The pH scale runs from 0 to 14; pH…
- Strong acids and bases ionise…
- Common salts like sodium chloride…
- Formulas and facts
- General reaction of acid with metal
- Acid with metal carbonate
- Acid with metal bicarbonate
- Neutralisation
- pH scale
- Baking soda (sodium bicarbonate)
- Washing soda
- Worked examples
- Reaction of zinc with dilute…
- Finding if a solution is acidic or…
- Neutralisation calculation…
- Watch out for
- Thinking all acids are dangerous…
- Confusing strong acids with…
- Writing H₂ gas release when acid…
- Believing pH 0 is neutral because…
- Forgetting water of crystallisation…
What this chapter is about
This chapter introduces the chemistry of three important categories of compounds: acids, bases and salts. You will learn how to identify acids and bases using indicators, understand their chemical properties, and see how they react with each other and with other substances like metals and carbonates.
Key ideas
- Acids are substances that produce hydrogen ions (H⁺) when dissolved in water; bases produce hydroxide ions (OH⁻) in water.
- Indicators like litmus, phenolphthalein and methyl orange change colour in acidic and basic solutions, helping us identify them.
- Acids react with metals to produce hydrogen gas and a salt; they react with metal carbonates and bicarbonates to produce carbon dioxide gas, water and a salt.
- Neutralisation is the reaction between an acid and a base to form salt and water: Acid + Base → Salt + Water.
- The pH scale runs from 0 to 14; pH below 7 is acidic, pH 7 is neutral, pH above 7 is basic.
- Strong acids and bases ionise completely in water; weak acids and bases ionise only partially.
- Common salts like sodium chloride, washing soda, baking soda and bleaching powder have important uses in daily life and industry.
Formulas and facts to remember
- General reaction of acid with metal: Metal + Acid → Salt + Hydrogen gas. Example: Zn + 2HCl → ZnCl₂ + H₂↑
- Acid with metal carbonate: Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂↑
- Acid with metal bicarbonate: NaHCO₃ + HCl → NaCl + H₂O + CO₂↑
- Neutralisation: NaOH + HCl → NaCl + H₂O
- pH scale: 0–14; pH 7 is neutral; lower pH means more acidic, higher pH means more basic.
- Baking soda (sodium bicarbonate): NaHCO₃; used in cooking, fire extinguishers, antacids.
- Washing soda: Na₂CO₃·10H₂O; used in glass, soap and paper industries.
- Bleaching powder: CaOCl₂; made by passing chlorine over dry slaked lime; used for disinfecting water.
- Plaster of Paris: CaSO₄·½H₂O; sets hard when mixed with water; used for casts and moulds.
Common mistakes
- Thinking all acids are dangerous liquids → Many acids like citric acid (in oranges) and acetic acid (in vinegar) are safe in dilute form and are part of food.
- Confusing strong acids with concentrated acids → Strong refers to complete ionisation; concentrated refers to amount of acid per unit volume. Dilute hydrochloric acid is still a strong acid.
- Writing H₂ gas release when acid reacts with carbonate → Carbonates release CO₂, not H₂; hydrogen gas comes from acid-metal reactions.
- Believing pH 0 is neutral because zero sounds like nothing → pH 7 is neutral; pH 0 is highly acidic.
- Forgetting water of crystallisation in salt formulas → Washing soda is Na₂CO₃·10H₂O, not just Na₂CO₃; the 10H₂O matters for its properties.
Quick revision
- Acids give H⁺ ions in water; bases give OH⁻ ions.
- Acid + Base → Salt + Water (neutralisation).
- Acid + Metal → Salt + H₂ gas; Acid + Carbonate → Salt + H₂O + CO₂ gas.
- pH scale: 0–14; below 7 acidic, 7 neutral, above 7 basic.
- Baking soda (NaHCO₃) neutralises excess stomach acid; washing soda (Na₂CO₃·10H₂O) softens hard water.
- Plaster of Paris sets hard by absorbing water to form gypsum.