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3. What is the purpose of washing a precipitate? Briefly explain how this is done. 4....

Question

3. What is the purpose of washing a precipitate? Briefly explain how this is done. 4....

3. What is the purpose of washing a precipitate? Briefly explain how this is done. 4. In addition to the step-by-step instruc
3. What is the purpose of washing a precipitate? Briefly explain how this is done. 4. In addition to the step-by-step instructions, the flow chart found on the previous page in quite useful in keeping track of the cations during the experiment. Sketch the flow chart so that the scheme is familiar before beginning the exercise.

Answers

3. The purpose  to wash the precipitate is to remove these adsorbed ions or other such impurities.When a substance gets precipitated, some ions that combine to form the precipitate get adsorbed/occluded/included on/inside the surface of the precipitate.

Three cause of impurities during precipitation of analyte are

1.Adsorption 2.inclusion 3 occlusionAdsoreffion The surface of appt may have a primary adsanked lager of the lattice on in exces This result in sweface adeouptroInclusion It occurs when ione generally of similar size and charge all entrapped within crycãe lattice when one con can replaOcclusion In ne process mê material which is not part of crystal structure is rather within the cugetal for eg:- Anali metal

gelateneous precipitate require more washing than crystalline precipitate

The washing of precipitate can be done by two ways

a.A precipitate may be washed directly on the filter by using wash water which will contain one ion common to the precipitate which would en hence the solubility of the impurities but at the same time should decrease the solubility of the precipitate .sometime organic impurities are washed with organic solvent

b)A precipitate may be washed by decantation .In decantation, the precipitate is allowed to settle, and the supernatant liquid is poured off ensuring all impurities are removed in the supernatent liquid.Multiples times decantation is done to ensure complete removal of the impurities.


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