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15 November, 07:26

What is the hydrogen ion concentration of a substance with a pH of 4.5?

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  1. 15 November, 10:03
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    The hydrogen ion concentration of the substance is 3.16*10⁻⁵ M

    Explanation:

    pH is a parameter used to measure the degree of acidity or alkalinity of a substance. The pH is calculated as the negative logarithm (base 10) of the concentration of hydronium ions [H₃O⁺] or hydrogen ions [H⁺].

    pH = - log [H₃O⁺] = - log [H⁺]

    Values on the pH scale range from 0 to 14, where pH equal to 7 is neutral, below 7 is acidic and above 7 is basic.

    In this case, pH = 4.5

    So:

    4.5 = - log [H⁺]

    Solving:

    [ H⁺] = 10⁻⁴ ⁵

    [H⁺] = 3.16*10⁻⁵ M

    The hydrogen ion concentration of the substance is 3.16*10⁻⁵ M
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