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Dictionary Meaning and Definition on 'Acidity'

Acidity Meaning and Definition from WordNet (r) 2.0
    acidity n
  1. the property of being acidic [syn: sourness, sour]
  2. the taste experience when something acidic is taken into the mouth [syn: acidulousness]
  3. pH values below 7 [ant: alkalinity]
Acidity Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Acidity \A*cid"i*ty\, n. [L. acidites, fr. acidus: cf. F. acidit['e]. See Acid.] The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.
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Wikipedia Meaning and Definition on 'Acidity'

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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Acidity Sample Sentences in News

  • World of Wine: Wine pairings for traditional Easter meals
    Some wines literally make one's mouth water, due largely to the acidity of the wine. A mouth that is flowing with saliva from sips of wine will be able to enjoy the food it takes in more enjoyable. Read more on this news related to 'Acidity'
  • We're offering $2m for the best ocean acidity mapping
    To keep the seas healthy, we need to measure how they are changing. It's no simple task, but here's an incentive, says oceans X Prize director Paul Bunje Read more on this news related to 'Acidity'
  • Adjusted calcium and acidity levels could make creamier reduced-fat foods
    Adjusting the calcium level and acidity could be the key to developing new better-tasting, more appealing looking and creamier reduced-fat sauces, desserts and salad dressings, according to research presented at a meeting of the American Chemical Society on 16 March 2014. Read more on this news related to 'Acidity'

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