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Properties of Bases > Chemical Properties

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  • Key Points: Chemical Properties of Bases
CISCE: Class 10

Key Points: Chemical Properties of Bases

  • Carbon Dioxide Absorption: Strong alkalis like NaOH and KOH absorb CO₂ from the air to form carbonates and water.
  • Neutralisation: Bases neutralise acids to form salt and water (e.g., Ca(OH)₂ + HCl → CaCl₂ + H₂O).
  • Precipitation of Hydroxides: Bases form insoluble hydroxides with salts of heavy metals like Cu, Fe, and Zn.
  • Amphoteric Hydroxides: Hydroxides of Zn, Al, and Pb dissolve in excess NaOH/KOH, forming soluble salts.
  • Ammonia Release: Alkalies release ammonia gas when heated with ammonium salts (e.g., NH₄Cl + NaOH → NH₃).
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