Answers

2014-04-05T13:24:33+05:30
The state that exists when acidic and basic ions in solution exactly neutralize each other is called acid -base equilibrium. 
Consider an acid, HA, in water. According to the Brønsted-Lowry acid/base theory, the acid should protonate the water to form hydronium and the conjugate base, A-. There will be an equilibrium between the acid and water, and hydronium and the conjugate base.
          This equilibrium can be used to calculate the concentrations of species in the solution.

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2014-04-05T23:43:21+05:30
When H+ ions and OH- ions are equal in nimber in a solution i.e. it is neutralised the it said to be in acid-base equilibrium.
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