Acids Bases and Salts Class 10 Science — Revision Notes
This chapter explores the properties and reactions of acids, bases, and salts, which are fundamental substances in chemistry. Students learn about pH scale
TL;DR: This chapter explores the properties and reactions of acids, bases, and salts, which are fundamental substances in chemistry. Students learn about pH…
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This chapter explores the properties and reactions of acids, bases, and salts, which are fundamental substances in chemistry. Students learn about pH scale
Acids and Bases
- Acids taste sour, turn blue litmus red, have pH less than 7
- Bases taste bitter, turn red litmus blue, have pH greater than 7
- pH scale ranges from 0 to 14; pH 7 is neutral
- Strong acids: HCl, H2SO4, HNO3; Strong bases: NaOH, KOH, Ca(OH)2
Indicators and pH
- Indicators are natural or synthetic substances showing color change at different pH
- Litmus: red in acid, blue in base
- Methyl orange: red in acid, yellow in base
- Phenolphthalein: colorless in acid, pink in base
Neutralization Reaction
- Acid + Base = Salt + Water
- HCl + NaOH = NaCl + H2O
- Neutralization is an exothermic reaction releasing heat
- pH of salt solution depends on strength of acid and base used
Salts and their Properties
- Salts are ionic compounds formed from neutralization
- Sodium chloride (NaCl) is table salt used for food
- Calcium carbonate (CaCO3) is limestone used in construction
- Ammonium nitrate (NH4NO3) is used as fertilizer
Key Terms
- pH: Measure of acidity or basicity on a scale of 0 to 14
- Neutralization: Reaction between acid and base producing salt and water
- Buffer Solution: Solution that resists change in pH when acid or base is added
Frequently Asked Questions
How do you identify if a substance is acidic or basic?
Use litmus paper or pH scale. Acidic substances turn blue litmus red (pH < 7), basic substances turn red litmus blue (pH > 7).
What happens when an acid reacts with a base?
Neutralization occurs producing salt and water. Heat is released. The resulting solution has a pH closer to 7 depending on acid-base strength.
More Class 10 Science Revision Notes
- Chemical Reactions and Equations
- Metals and Non-metals
- Carbon and its Compounds
- Life Processes
- Control and Coordination
- How do Organisms Reproduce
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