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  2. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    In chemistry, pH ( / piːˈeɪtʃ / pee-AYCH ), also referred to as acidity or basicity, historically denotes " potential of hydrogen " (or "power of hydrogen"). [ 1 ] It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions (solutions with higher concentrations of hydrogen ( H+) ions) are ...

  3. Acidity function - Wikipedia

    en.wikipedia.org/wiki/Acidity_function

    Weak. v. t. e. An acidity function is a measure of the acidity of a medium or solvent system, [1] [2] usually expressed in terms of its ability to donate protons to (or accept protons from) a solute ( Brønsted acidity ). The pH scale is by far the most commonly used acidity function, and is ideal for dilute aqueous solutions.

  4. Tanner scale - Wikipedia

    en.wikipedia.org/wiki/Tanner_scale

    The Tanner scale (also known as the Tanner stages or sexual maturity rating ( SMR )) is a scale of physical development as children transition into adolescence and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics, such as the size of the breasts, genitals ...

  5. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    Universal indicator. A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution. [1]

  6. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH ( acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [ 1] Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...

  7. AOL Mail

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    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  8. Alkalinity - Wikipedia

    en.wikipedia.org/wiki/Alkalinity

    Alkalinity. Sea surface alkalinity (from the GLODAP climatology ). Alkalinity (from Arabic: القلوية, romanized : al-qaly, lit. 'ashes of the saltwort ') [ 1] is the capacity of water to resist acidification. [ 2] It should not be confused with basicity, which is an absolute measurement on the pH scale.

  9. Weak base - Wikipedia

    en.wikipedia.org/wiki/Weak_base

    Strong. Superbases. Non-nucleophilic. Weak. v. t. e. A weak base is a base that, upon dissolution in water, does not dissociate completely, so that the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical, and a large proportion of undissociated molecules of the base.