Dictionary Meaning and Definition on 'Acidic'
- being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) [ant: alkaline, amphoteric]
- tasting sour like acid [syn: acidulent, acidulous]
- Acidic \A*cid"ic\, a. (Min.)
Containing a high percentage of silica; -- opposed to
Wikipedia Meaning and Definition on 'Acidic'
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 pHs of less than 7, 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.
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.[See more about Acidic at Dictionary 3.0 Encyclopedia]
Words and phrases related to 'Acidic'
Acidic Sample Sentences in News
- L.A.-based Acidic performs Dec. 8 at Jokers in Richland
Acidic guitarist Michael Gossard was almost 13 years old when he auditioned for a position with a Di Read more on this news related to 'Acidic'
- Global Warming Causes 'Acid Indigestion' for Sea Urchins
Spiny green sea urchins face a new challenge from climate change: As the oceans become more acidic, urchin larvae struggle to digest their food, new research finds. The study is the first to prove that ocean acidification can cause digestive problems for marine animals, though scientists have long been alarmed at the trend for other reasons. Earlier studies have f Read more on this news related to 'Acidic'
- Rain as acidic as lemon juice may have contributed to ancient mass extinction
Rain as acidic as undiluted lemon juice may have played a part in killing off plants and organisms around the world during the most severe mass extinction in Earth's history. Read more on this news related to 'Acidic'