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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

  • Acidic drinks may damage kids’ teeth
    HIGH acidity levels in soft drinks, fruit juice and sports beverages pose a threat to youngsters’ teeth, a new study reports.... Read more on this news related to 'Acidity'
  • Warning to parents on high acidity drinks
    Dental researchers at the University of Adelaide are warning parents of the dangers of soft drinks, fruit juice, sports drinks and other drinks high in acidity, which form part of a “triple-threat” of permanent damage to young people’s teeth. For the first time, researchers have been able to demonstrate that lifelong damage is caused by...  [Read More...] Read more on this news related to 'Acidity'
  • Soft drinks can wreak teeth of teenagers
    Melbourne, Aug 6 (IANS) The next time you buy a soft drink for your kid, think again! Researchers have found that soft drinks, fruit juice, sports drinks and other drinks high in acidity form part of a "triple-threat" of permanent damage to young people's teeth. Drinks high in acidity combined with night-time tooth grinding and reflux can cause major Read more on this news related to 'Acidity'

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