Are the properties of rain water different than those of tap water?

Answer by  buck (22)

The water itself if not any different since the any H2O molecule is exactly the same as any other. The only difference, therefore, would come from any dissolved impurities in the tap water. Since rain water is re-condensed water that has evaporated previously it is usually quite pure.

Answer by  symister (47)

Yes. Almost all water has some impurities in it. The main difference between rain water and tap water is the impurities. Impurities in rain water may come from air pollution and dust or gases in the air. Impurities of tap water may include rain water impurities along with pollutants and minerals from the ground and impurities from the water pipes.

Answer by  e36 (170)

They are broadly the same - rain water is likely to be more acidic due to atmospheric pollution and carbon dioxide dissolved in it, whereas tap water is likely to have limestone, lead or similar trace elements dissolved in it and will contain more particulate matter. Rain water will be purer, but it depends on the local water supply's quality.

Answer by  Connor (43)

Cities frequently add chlorine to reduce contamination by germs or other pathogens. Often, cities also add fluorine to strengthen the teeth of those who drink it.

Answer by  ringneck (394)

Rain water is mostly natural unless it is acid rain. Tap water has generally been treated if it is part of a municipal or other government entity water system.