News tagged with acid
Scientists from Nanyang Technological University (NTU) and Lund University, Sweden, have bioengineered a novel molecule which has been proven to successfully kill tumour cells.
Cancer 20 hours ago | 5 / 5 (2) | 0
(HealthDay)—Obese and overweight men and women who suffer from heartburn often report relief when they lose weight, a new study shows.
Diseases, Conditions, Syndromes 21 hours ago | not rated yet | 0 |
There are significant cost and risk factors associated with two procedures commonly used to diagnose or treat gastrointestinal problems, according to research presented at Digestive Disease Week (DDW).
Diseases, Conditions, Syndromes May 19, 2013 | not rated yet | 0
(HealthDay)—Blood levels of free fatty acids are associated with insulin resistance during young adulthood and cardiovascular risk factors in later adulthood, according to a study published online May 13 ...
Cardiology May 17, 2013 | not rated yet | 0 |
Researchers at Tokyo Institute of Technology report details on the biological mechanisms through which cells degrade own cellular material, allowing them to survive starvation conditions.
Medical research May 17, 2013 | 5 / 5 (1) | 0 |
Spanish researchers have studied how job stress affects cardiovascular health. The results, published in the 'Scandinavian Journal of Public Health', link this situation to dyslipidemia, a disorder that a ...
Health May 16, 2013 | 5 / 5 (1) | 0
(Medical Xpress)—Investigation by researchers from the University of Exeter and ETH Zurich has shed new light on a protein which is linked to a common neurological disorder called Charcot-Marie-Tooth disease.
Neuroscience May 16, 2013 | not rated yet | 0 |
Despite previous studies touting its benefit in moderating gout risk, new research reveals that vitamin C, also known ascorbic acid, does not reduce uric acid (urate) levels to a clinically significant degree in patients ...
Health May 16, 2013 | 1 / 5 (1) | 1
The connection between human avian-origin influenza A (H7N9) virus infection and environmental sources of the virus were determined based on clinical data, epidemiology, and virological characteristics of the three early ...
Diseases, Conditions, Syndromes May 15, 2013 | 5 / 5 (1) | 0
Necrotizing Entercolitis, an infection and inflammation that causes destruction of the intestine,affects about 10,000 babies a year in the country, and mortality rates are roughly 40 percent.
Medical research May 10, 2013 | not rated yet | 0
(HealthDay)—For patients with multiple cardiovascular risk factors or atherosclerotic vascular disease who have not had a myocardial infarction, daily treatment with n-3 fatty acids does not reduce cardiovascular ...
Cardiology May 09, 2013 | not rated yet | 0
Eating fish is good for your heart, but taking fish oil capsules does not help people at high risk of heart problems who are already taking medicines to prevent them, a large study in Italy found.
Cardiology May 08, 2013 | 4 / 5 (1) | 0
Sanjeevi Sivasankar knows a lot about how the healthy cells in your body stick together.
Cancer May 08, 2013 | not rated yet | 0
(HealthDay)—Pregnant women who struggle with migraine headaches should never use medicines containing the ingredient valproate because they can lower the IQ scores of their children, the U.S. Food and Drug ...
Medications May 06, 2013 | not rated yet | 0
(HealthDay)—Pimples have long been the bane of teenage existence, but pediatricians say there is now enough evidence on effective treatments to put out the first guidelines on battling acne in children.
Pediatrics May 06, 2013 | 4 / 5 (3) | 0 |
An acid (from the Latin acidus/acēre meaning sour) is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH of less than 7, where an acid of lower pH is typically stronger, and turn blue litmus paper red. Chemicals or substances having the property of an acid are said to be acidic.
Common examples of acids include acetic acid (in vinegar), sulfuric acid (used in car batteries), and tartaric acid (used in baking). As these three examples show, acids can be solutions, liquids, or solids. Gases such as hydrogen chloride can be acids as well. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid.
There are three common definitions for acids: the Arrhenius definition, the Brønsted-Lowry definition, and the Lewis definition. The Arrhenius definition states that acids are substances which increase the concentration of hydronium ions (H3O+) in solution. The Brønsted-Lowry definition is an expansion: an acid is a substance which can act as a proton donor. Most acids encountered in everyday life are aqueous solutions, or can be dissolved in water, and these two definitions are most relevant. The reason why pHs of acids are less than 7 is that the concentration of hydronium ions is greater than 10−7 moles per liter. Since pH is defined as the negative logarithm of the concentration of hydronium ions, acids thus have pHs of less than 7. By the Brønsted-Lowry definition, any compound which can easily be deprotonated can be considered an acid. Examples include alcohols and amines which contain O-H or N-H fragments.
In chemistry, the Lewis definition of acidity is frequently encountered. Lewis acids are electron-pair acceptors. Examples of Lewis acids include all metal cations, and electron-deficient molecules such as boron trifluoride and aluminium trichloride. Hydronium ions are acids according to all three definitions. Interestingly, although alcohols and amines can be Brønsted-Lowry acids as mentioned above, they can also function as Lewis bases due to the lone pairs of electrons on their oxygen and nitrogen atoms.
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