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    pH

    • Last Update: 2020-11-23
    • Source: Internet
    • Author: User
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    pH is used to indicate




    solutions with very small concentrations of
    H
    (H ) in 1 to 10 -10 14between
    mol/L)
    acid-base
    strong and weak indicator, numerically equal to the negative pair of hydrogen ion concentration: pH-lg (H

    ).


    This method of representing the acidity and alkalinity of the solution is particularly convenient for



    ) small solutions. For example,


    ) is an alkaline
    solution of 10 mol/L, whose pH-lg10is 9.

    2.pH

    <
    7, the solution is acidic. The smaller the pH, the greater the acidity and the smaller the alkalinity.


    pH

    >
    7, the solution is alkaline, the greater the pH, the greater the alkalinity, the less acidity.


    pH is

    , and the solution is neutral. When the
    of the solution

    >1mol/L, the acidity
    of the solution is generally indicated by the pH ) instead of pH. The pH of the solution is usually determined by acid-base indicator, pH
    paper
    , and the most accurate method of determination is by pH meter. The acidity and alkalinity of the solution can also be expressed by the negative pair of oh - in the solution, i.e. pOH-lg (OH ). At 25 degrees C, the ion product of water is Kw×10 -14 , which infers that
    pH pOH is 14. The pOH value can be calculated by the pH value. pOH<7 is an alkaline solution, pOH=7 is a neutral solution, and pOH>7 is an acidic solution.



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