Acid
hideAn acid (from the Latin acidus meaning sour) is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion activity greater than in pure water, i.e. a pH less than 7.0. That approximates the modern definition of Johannes Nicolaus Brønsted and Martin Lowry, who independently defined an acid as a compound which donates a hydrogen ion (H+) to another compound (called a base). Common examples include acetic acid (in vinegar) and sulfuric acid (used in car batteries). Acid/base systems are different from redox reactions in that there is no change in oxidation state. Acids can occur in solid, liquid or gaseous form, depending on the temperature. They can exist as pure substances or in solution.
Chemicals or substances having the property of an acid are said to be acidic (adjective).
For more information about Acid, read the full article at
Wikipedia.
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News tagged with acid
Fatty acids clue for Alzheimer's
Medicine & Health / Neuroscience
Nov 13, 2009 |
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(PhysOrg.com) -- The amount of fatty acids in the brain varies between healthy people and those with Alzheimer's according to new research from the University of Bristol, UK, supported by the Alzheimer's Research ...
Explained: RNA interference
Nov 12, 2009 |
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Every high school biology student learns the basics of how genes are expressed: DNA, the cell’s master information keeper, is copied into messenger RNA, which carries protein-building instructions to the ribosome, ...
Drought resistance explained
Nov 09, 2009 |
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Much as adrenaline coursing through our veins drives our body's reactions to stress, the plant hormone abscisic acid (ABA) is behind plants' responses to stressful situations such as drought, but how it does ...
Scientists Reproduce a Building Block of Life in Laboratory
Nov 06, 2009 |
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(PhysOrg.com) -- NASA scientists studying the origin of life have reproduced uracil, a key component of our hereditary material, in the laboratory.
Study links folic acid supplements to asthma
Nov 04, 2009 |
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A University of Adelaide study may have shed light on the rise in childhood asthma in developed countries like Australia in recent decades.
Cause of common chronic diarrhea revealed in new research
Nov 02, 2009 |
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(PhysOrg.com) -- A common type of chronic diarrhoea may be caused by a hormone deficiency, according to new research published in the November issue of Clinical Gastroenterology and Hepatology. The author ...
Previously Unknown Volcanic Eruption Helped Trigger Cold Decade
Space & Earth / Earth Sciences
Oct 29, 2009 |
4.3 / 5 (27) |
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(PhysOrg.com) -- A team of chemists from the U.S. and France has found compelling evidence of a previously undocumented large volcanic eruption that occurred exactly 200 years ago, in 1809.
Mortality rates reduced among children whose mothers received iron-folic acid supplements
Oct 28, 2009 |
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Offspring whose mothers had been supplemented with iron-folic acid during pregnancy had dramatically reduced mortality through age 7, according to researchers at the Johns Hopkins Bloomberg School of Public Health. Researchers ...
Exposure to alkaline substances can result in damaged teeth
Oct 27, 2009 |
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It has long been known that acids can erode tooth enamel but a new Swedish study from the Sahlgrenska Academy at the University of Gothenburg, Sweden, shows that strong alkaline substances can damage teeth too - substances ...
Researchers evaluate new bowel prep approaches
Oct 26, 2009 |
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While there is little doubt concerning the effectiveness of colonoscopy procedures to detect colon cancer, a new study presented at the American College of Gastroenterology's 74th Annual Scientific Meeting in San Diego places ...
Surgeons at BMC offering new procedure for acid reflux/GERD
Oct 26, 2009 |
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Boston Medical Center (BMC) surgeons are now offering patients an incisionless alternative to laparoscopic and traditional surgery for treatment of acid reflux or GERD.
Scientists reveal secrets of drought resistance
Oct 22, 2009 |
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A team of biologists in California led by researchers at The Scripps Research Institute and the University of California, San Diego has solved the structure of a critical molecule that helps plants survive during droughts. ...
Getting on 'the GABA receptor shuttle' to treat anxiety disorders
Medicine & Health / Psychology & Psychiatry
Oct 22, 2009 |
4.5 / 5 (2) |
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There are increasingly precise molecular insights into ways that stress exposure leads to fear and through which fear extinction resolves these fear states. Extinction is generally regarded as new inhibitory learning, but ...
Scientists visualize assembly line gears in ribosomes, cell's protein factory
Oct 15, 2009 |
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Even as research on the ribosome, one of the cell's most basic machines, is recognized with a Nobel Prize, scientists continue to achieve new insights on the way ribosomes work.
Sweet Potato Protection is More Than Skin Deep
Oct 15, 2009 |
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(PhysOrg.com) -- Sweet potatoes are a seasonal staple that earn U.S. producers some $370 million every year. Now Agricultural Research Service (ARS) scientists have found traits in sweet potatoes that someday ...
