Briefly describe the processes by which the soluble impurities are removed from
water.
Answers
Explanation:
Removal of coarse, dispersed and colloidal impurities from water is known as clarification. These impurities may be removed either by filtration or by sedimentation.
(a) Sedimentation:
The simplest way to clarify muddy water is to allow the suspended material in it to settle, the process is known as sedimentation. In filtration the water is clarified by passing it through a porous material, which retains coarse impurities on its surface and in its pores.
(b) Filtration:
The apparatus used for filtration is called filter and the porous material that fills the filter is known as filtering material or medium.
The process of sedimentation allows solid particles to settle down on the bottom of the settling tank in which water undergoing clarification is at rest or in slow horizontal or upward notion.
(c) Coagulation:
Silt particles are small enough to remain in colloidal suspension that cannot removed by sedimentation. The process of coagulation is used to remove colloidal particles from water.
The process of consolidation of colloidal particles, terminating in precipitation of the substances removed from the treated water by settling or filtration is called coagulation
Simple words
To remove soluble impurities, first, by doing solubility tests, a suitable solvent is chosen (high solubility in hot solvent, low solubility in cold solvent). The soluble impurities are then removed as follows: the desired compound along with the soluble impurities are dissolved in a MINIMUM of near-BOILING solvent
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Explanation:
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