Why do you prepare standard solution in distilled water
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A solution whose concentration is accurately known is called a standard solution.
A standard solution can be prepared by weighing method in the following way.
(a) The mass of solute needed is calculated and weighed.
(b) The solute is dissolved in some distilled water in a beaker.
(c) The solution is transferred into a volumetric flask.
(d) More distilled water is added to obtain the required volume. The flask is stoppered and shaken.
For example, to prepare 1.0 dm3 of 0.50 mol dm-3 aqueous sodium hydroxide
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