logarithmic scale is the definition of ph in water.
logarithmic scale is the definition of ph in water.
what is the definition of ph in water?
logarithmic scale
precipitation with low potential of hydrogen levels (ph), otherwise known as acid rain, is also a frequent risk produced by lightning. distilled water, which contains no carbon dioxide, has a neutral ph of 7. liquids with a ph less than 7 are acidic, and those with a ph greater than 7 are bases. "clean" or unpolluted rain has a slightly acidic ph of about 5.2, because carbon dioxide and water in the air react together to form carbonic acid, a weak acid (ph 5.6 in distilled water), but unpolluted rain also contains other chemicals. nitric oxide present during thunderstorm phenomena, caused by the splitting of nitrogen molecules, can result in the production of acid rain, if nitric oxide forms compounds with the water molecules in precipitation, thus creating acid rain. acid rain can damage infrastructures containing calcite or other solid chemical compounds containing carbon. in ecosystems, acid rain can dissolve plant tissues of vegetations and increase acidification process in bodies of water and in soil, resulting in deaths of marine and terrestrial organisms.
storm
pure water has a ph close to 7 (neither alkaline nor acidic). sea water can have ph values that range from 7.5 to 8.4 (moderately alkaline). fresh water can have widely ranging ph values depending on the geology of the drainage basin or aquifer and the influence of contaminant inputs (acid rain). if the water is acidic (lower than 7), lime, soda ash, or sodium hydroxide can be added to raise the ph during water purification processes. lime addition increases the calcium ion concentration, thus raising the water hardness. for highly acidic waters, forced draft degasifiers can be an effective way to raise the ph, by stripping dissolved carbon dioxide from the water. making the water alkaline helps coagulation and flocculation processes work effectively and also helps to minimize the risk of lead being dissolved from lead pipes and from lead solder in pipe fittings. sufficient alkalinity also reduces the corrosiveness of water to iron pipes. acid (carbonic acid, hydrochloric acid or sulfuric acid) may be added to alkaline waters in some circumstances to lower the ph. alkaline water (above ph 7.0) does not necessarily mean that lead or copper from the plumbing system will not be dissolved into the water. the ability of water to precipitate calcium carbonate to protect metal surfaces and reduce the likelihood of toxic metals being dissolved in water is a function of ph, mineral content, temperature, alkalinity and calcium concentration.
water purification