how can we change the concentration of acidic solutions
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To decrease the concentration or to dilute the solution, water should be added. Or if its a strong acid, then a weak base can also be added, in which case, a few moles of acid are neutralised and the overall concentration of the acid is reduced.
To increase the concentration, the amount of water should be reduced. This can be done by boiling or distillation of the solution. Or another method is to add excess of acid to the solution, in which case also, the concentration of the acid will increase.
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