Why it is essential to wash the precipitate with water before estimating is its quantitatively?
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The precipitates(product) formed out from any chemical reaction always contains some traces of unwanted materials (unreacted reactants or catalyst & certain impurities). These unwanted materials adsorbed onto the surface of the required prduct & settle down at the bottom of the container. For quantitative estimation of the product , these unwanted materials has to be removed. For removal of unwanted materials, different methods are used , one of them is washing with water. Because most of the impurities are water soluble
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