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Dictionary Meaning and Definition on 'Acidic'

Acidic Meaning and Definition from WordNet (r) 2.0
    acidic adj
  1. being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) [ant: alkaline, amphoteric]
  2. tasting sour like acid [syn: acidulent, acidulous]
Acidic Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Acidic \A*cid"ic\, a. (Min.) Containing a high percentage of silica; -- opposed to basic.
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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.

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Acidic Sample Sentences in News

  • California Experiments With A Fix To Acidifying Oceans
    Marine biologists are witnessing oceans grow more acidic. There may be hope though; some pockets of underwater sea grasses along coastlines help buffer the acidity like an antacid does for heartburn. Read more on this news related to 'Acidic'
  • USGS Release: Large Rivers in U.S. are Becoming Less Acidic
    Summary: Several large rivers in the U.S. are less acidic now, due to decreasing acidic inputs, such as industrial waste, acid mine drainage, and atmospheric deposition. Contact Information: Ethan Alpern ( Phone: 703-648-4406 ); Edward Stets ( Phone: 303-541-3048 ); Several large rivers in the U.S. are less acidic now, due to decreasing acidic inputs, such as in Read more on this news related to 'Acidic'
  • Global Holdings, Inc's (GBHD) Wholly-Owned Subsidiary Wellness Water Finalizes Formulas
    Global Holdings, Inc.'s wholly-owned subsidiary Wellness Water finalized its bottle water formulas. All Wellness Water products are infused with negative ions. Most purified waters are acidic and positively ... Read more on this news related to 'Acidic'

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