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Write notes on the properties of bases. -

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Question

Write notes on the properties of bases.

Answer in Brief

Solution

  1. They have a bitter taste.

  2. Their aqueous solutions have soapy touch.

  3. They turn red litmus blue.

  4. Their aqueous solutions conduct electricity.

  5. Bases react with metals to form a salt with the liberation of hydrogen gas.
    Zn + 2 NaOH → Na2ZnO2 + H2

     

  6. Bases react with non-metallic oxides to produce salt and water. Since this is similar to the reaction between a base and an acid, we can conclude that non-metallic oxides are acidic in nature,
    Ca(OH)2 + CO2 → CaCO3+ H2O

     

  7. Bases react with acids to form salt and water.
    KOH + HCl → KCl + H2O
    The above reaction between a base and an acid is known as the Neutralisation reaction.

     

  8. On heating with ammonium salts, bases give ammonia gas.
    NaOH + NH4Cl → NaCl + H2O+ NH3

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