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  2. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    e. 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. Methyl orange - Wikipedia

    en.wikipedia.org/wiki/Methyl_orange

    Methyl orange is a pH indicator frequently used in titration because of its clear and distinct color variance at different pH values. Methyl orange shows red color in acidic medium and yellow color in basic medium. Because it changes color at the p Ka of a mid strength acid, it is usually used in titration of strong acids in weak bases that ...

  4. Orange (fruit) - Wikipedia

    en.wikipedia.org/wiki/Orange_(fruit)

    Orange (fruit) Orange—whole, halved, and peeled segment. An orange, also called sweet orange to distinguish it from the bitter orange ( Citrus × aurantium ), is the fruit of a tree in the family Rutaceae. Botanically, this is the hybrid Citrus × sinensis, between the pomelo ( Citrus maxima) and the mandarin orange ( Citrus reticulata ).

  5. Purple - Wikipedia

    en.wikipedia.org/wiki/Purple

    Purple has long been associated with royalty, originally because Tyrian purple dye—made from the secretions of sea snails—was extremely expensive in antiquity. Purple was the color worn by Roman magistrates; it became the imperial color worn by the rulers of the Byzantine Empire and the Holy Roman Empire, and later by Roman Catholic bishops.

  6. Xylenol orange - Wikipedia

    en.wikipedia.org/wiki/Xylenol_orange

    Xylenol orange is an organic reagent, most commonly used as a tetrasodium salt as an indicator for metal titrations. When used for metal titrations, it will appear red in the titrand and become yellow once it reaches its endpoint. Historically, commercial preparations of it have been notoriously impure, [2] sometimes consisting of as little as ...

  7. Purple Violets - Wikipedia

    en.wikipedia.org/wiki/Purple_Violets

    English. Budget. $4 million [1] Purple Violets is a 2007 American independent romantic comedy film written and directed by Edward Burns, who also co-stars. It is set in lower Manhattan, about four friends from college who unexpectedly meet again after twelve years apart. The film stars Selma Blair, Patrick Wilson, Debra Messing and Burns.

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