Iupac Name: Water, Oxidane. Other Names: Hydrogen Oxide, Hydric Acid, Hydrol. Cas: 7732-18-5. Chemical Formula: H2O. Molar Mass: 18.01 G/Mol
Wkipedia In chemical and biological laboratories, as well as in industry, cheaper alternatives such as deionised water are preferred to distilled water.But if these alternatives are not pure enough, distilled water is used. If exceptionally high-purity water is required, double distilled water is used.
In general, non-purified water could cause or interfere with chemical reactions as well as leave mineral deposits after boiling away. One method of removing impurities from water and other fluids is distillation.
For example, ions commonly found in tap water would drastically reduce lifespans of lead–acid batteries used in cars and trucks. These ions are not acceptable in automotive cooling systems because they corrode internal engine components and deplete typical antifreeze anti-corrosion additives.
Any non-volatile or mineral components in water are left behind when the water evaporates or boils away. Water escaping as steam, for example from a boiler of heating system or steam engine, leaves behind any dissolved materials leading to mineral deposits known as boiler scale.
Low-volume humidifiers such as cigar humidors can use distilled water to avoid mineral deposits.
Certain biological applications require controlled impurities, especially in experiments. For example, distilling water to be added to an aquarium would remove known and unknown non-volatile contaminants. Living things require specific minerals; adding distilled water to an ecosystem, such as an aquarium, would reduce the concentration of these minerals. Fish and other living things that have evolved to survive in lakes and oceans should be expected to thrive at mineral ranges found in their original habitat.
Controlled impurities as well as equipment reliability are critically important in medical applications where, for example, distilled water is used in Constant Positive Airway Pressure (CPAP) machines to humidify air for breathing. Distilled water will not leave contaminants behind when the humidifier in the CPAP machine evaporates the water.
It is also possible for brewers to blend distilled water with hard water to mimic the soft waters of Pilsen.
Another application was to increase the density of the air to assist early airplane jet engines during takeoff in “hot and high” atmospheric conditions, as was used on the early Boeing 707.
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