1. Bases are compounds which react with acid to form a salt and water as only products.
  2. Bases that soluble in water are called alkalis.
  3. In aqueous solution, alkali it produces hydroxide ions (OH-). In short, alkalis are substances that form hydroxide ions (OH-(aq)) in water
    Sodium hydroxide NaOH gives Na+(aq) and OH-(aq) ions,

    NaOH → Na+ + OH-

    calcium hydroxide Ca(OH)2 gives Ca2+(aq) and 2OH-(aq)  ions.

    Ca(OH)2 → Ca2+ + 2OH-

    Ammonia give NH4+ and OH-

    NH3 + H2O → NH4+ + OH-

    [Note: an alkali is a base soluble in water.]

  4. In alkaline solution there are more OH- ions than H+ ions.


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