Question

What remains after the impurities have been removed from water?

Answer 1

After impurities are removed from water, it is mainly water (H2O) with greatly reduced levels of dissolved solids, pollutants, and organic materials, achieved primarily through filtration and potentially other treatment processes.

Step-by-step explanation:

After impurities have been removed from water, what essentially remains is water with significantly reduced concentrations of dissolved solids, pollutants, and organic materials. Filtration is one of the primary methods used to remove these impurities, where water passes through substances such as sand, gravel, and charcoal. In the process, most bacteria, turbidity, color, and odors are removed, making the water substantially cleaner.

It should be noted, however, that water in its purest form is H2O, a product that can be approached through extensive purification processes, but is not commonly found in nature due to water's ability to dissolve and carry minerals and other substances. As the filtration process is utilized, it can be augmented by additional treatments such as the reprecipitation of aluminum hydroxide to further clarify water. For instance, after primary treatment of wastewater, you might notice that much of the dissolved solids have been removed, but certain harmful microorganisms and pollutants may still be present until further treatment is applied.

Answer 2

What remains is pure water or purified water

The most common example of this is distilled water. When you distill water you remove the impurities by boiling it and then recondensing it which removes the impurities. There are other ways to achieve this but distillation is the most common since it's been used traditionally forever and was relatively easy to do.