How does the precipitation process work to control water pollution?

precipitation is a useful method to
1. heavy metals
2.light pollutants
3. all metals

pollutants that have become insoluble solids after chemical precipitation are removed
1. biological action
2.filtration
3. air sparging

First: 1- Heavy Metals

Second: 2- Filtration

Explanation:

In the case of polluted water treatment, the removal of heavy metals can be done by various processes, one of which is chemical precipitation. Precipitation is a process in which a solid forms during the chemical reaction, this solid formed is called a precipitate. Interestingly, the method by which the precipitate is removed, is the filtration process that answers the second item of the question.

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.