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This is not nessesory because most of the soluble impurities are minarals and minerals are healthy for our body.This why the city waterworks allow the soluble impurities
These crystals are residues from soluble impurities.
chemicals
If you think to mechanical impurities- by filtering.
Because the presence of even a small amount of impurities makes water a good conductor like pond water
Presence of soluble impurities in water generally causes elevation of boiling point.
All three purify the blood. The lungs help remove carbon dioxide, the kidneys remove water-soluble waste and the liver removes fat soluble wastes and many other impurities from the blood.
The purpose of water washing the organic layer is for aqueous extraction to remove impurities and or reagents that are water soluble. For instance, in reactions that utilize a small tertiary amine base or inorganic base.
Ofcourse,rock salt is soluble in water as it is the salt obtained from pieces of rock made by salt.only the impurities in the rock salt will not dissolve impurities may be dirt,dust or salt.There may be some other soluble material also in the rock salt.
chlorine
yes
trees will remove the impurities in the water.