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
- NOAA Scientists Embark on Voyage to Assess Ocean Acidification
Rising CO2 levels will also make seawater more acidic -- Read more on ScientificAmerican.com Read more on this news related to 'Acidic'
- Acidic water blamed for West Coast scallop die-off
Ten million scallops that have died in the waters near Qualicum Beach due to rising ocean acidity are the latest victims in a series of marine die-offs that have plagued the West Coast for 10 years. Human-caused carbon dioxide emissions in the atmosphere are being absorbed by the ocean and may have pushed local waters through a “tipping point” of acidity beyon Read more on this news related to 'Acidic'
- News at Nine, March 5
Oceans growing too acidic, according to UH researcher Read more on this news related to 'Acidic'