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  2. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    The pH range is commonly given as zero to 14, but a pH value can be less than 0 for very concentrated strong acids or greater than 14 for very concentrated strong bases. [2] The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. [3]

  3. Op. 7 - Wikipedia

    en.wikipedia.org/wiki/Op._7

    In music, Op. 7 stands for Opus number 7. Compositions that are assigned this number include: Barber – Music for a Scene from Shelley Beethoven – Piano Sonata No. 4 ...

  4. PH7 - Wikipedia

    en.wikipedia.org/wiki/PH7

    The center of the pH scale, describing a solution in water that is neither basic nor acidic. pH7 (Peter Hammill album), an album by Peter Hammill

  5. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    In and of themselves, pH indicators are usually weak acids or weak bases. The general reaction scheme of acidic pH indicators in aqueous solutions can be formulated as: HInd (aq) + H 2 O (l) ⇌ H 3 O + (aq) + Ind − (aq) where, "HInd" is the acidic form and "Ind −" is the conjugate base of the indicator. Vice versa for basic pH indicators ...

  6. Acid–base titration - Wikipedia

    en.wikipedia.org/wiki/Acid–base_titration

    The pH after the equivalence point depends on the concentration of the conjugate base of the weak acid and the strong base of the titrant. However, the base of the titrant is stronger than the conjugate base of the acid. Therefore, the pH in this region is controlled by the strong base. As such the pH can be found using the following: [1]

  7. Mazurkas, Op. 7 (Chopin) - Wikipedia

    en.wikipedia.org/wiki/Mazurkas,_Op._7_(Chopin)

    The Mazurkas, Op. 7 are a set of five mazurkas by Frédéric Chopin.The mazurkas were mostly written in 1830–1831 and were published in 1832. This is the only set of Chopin's mazurkas that contains 5 pieces; all the composer's other published sets consist of either 3 or 4 mazurkas each.

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    mail.aol.com

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  9. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    Paper form: It is a strip of coloured paper which changes colour to red if the solution is acidic and to blue, if the solution is basic. The strip can be placed directly onto a surface of a wet substance or a few drops of the solution can be dropped onto the universal indicator using dropping equipment.