Search results
Results from the WOW.Com Content Network
The drainage water from the Iron Mountain Mine is the most acidic water naturally found on Earth; some samples collected in 1990 and 1991 have been measured to have a pH value of -3.6. [3] Water temperatures as high as 47 °C have been measured underground.
Fluoroantimonic acid is a mixture of hydrogen fluoride and antimony pentafluoride, containing various cations and anions (the simplest being H 2 F + and Sb F − 6).This mixture is a superacid that, in terms of corrosiveness, is trillions of times stronger than pure sulfuric acid when measured by its Hammett acidity function.
In chemistry, a superacid (according to the original definition) is an acid with an acidity greater than that of 100% pure sulfuric acid (H 2 SO 4), [1] which has a Hammett acidity function (H 0) of −12.
Carborane acids H(CXB 11 Y 5 Z 6) (X, Y, Z = H, Alk, F, Cl, Br, CF 3) are a class of superacids, [1] some of which are estimated to be at least one million times stronger than 100% pure sulfuric acid in terms of their Hammett acidity function values (H 0 ≤ –18) and possess computed pK a values well below –20, establishing them as some of the strongest known Brønsted acids.
STORY: Oceans reached their hottest and most acidic levels on record in 2021, and melting ice sheets pushed sea levels to new heights, the World Meteorological Organization said on Wednesday (May 18).
The coexistence of such extreme physicochemical characteristics (pH, salinity, high temperature, lack of oxygen, etc.) render Dallol one of the very few ‘poly-extreme’ sites on Earth. [1] This is why Dallol is a key system for astrobiological studies investigating the limits of life. [15]
The more acidic the waters are, the more recorded Fe, Al, and Si elemental compounds. Conversely, waters with pH’s higher than 4 are nearly void of HCO 3 − . The amount of Fe in the waters has a positive correlation with salinity, with the higher the salinity of the water the higher Fe value is present.
On Earth, jarosite is mainly associated with the ultimate stage of pyrite oxidation in clay environment, and can also be found in mine tailings waste where acidic conditions prevail. Against all expectations, jarosite has also been fortuitously discovered in minute quantities in the form of small dust particles in ice cores recovered from a ...