In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove?
large particles
germs
fine particles
odour
Explanation
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Pipe borne water for township. B/4 water bcum fit 4 drinking, it undergoes some processes of purification wic include Coagulation, sedimentation,filtration and disinfection. The untreated water is pass tru large settling tanks wia some chemicals such as potash alum [kal(SO4)2] n sodium aluminate (ii) (NaHCO2) are added to cause coagulation. As large particles of dirt clump 2geda & settle @ d bottom of d tanks as Impurities.
the answer is c. it causes fine particles to clump together, forming large particles heavy enough to settle.
. Large settling tanks with sodium aluminate (III) are typically used to facilitate the coagulation and settling of fine particles in water. Sodium aluminate helps in forming flocs by neutralizing the charges on colloidal particles, making them easier to settle. Therefore, the primary purpose is to remove fine particles, making option C more accurate in this context.
Coagulation removes large particles, followed by filtration which removes fine particles.
Ref : Understanding Chemistry Page 126
