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26 September, 23:07

calculate the pH of a 0.00234 M HBr solution. Assume HBr dissociates completely in water. pH=

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  1. 26 September, 23:25
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    The pH value is 2.63, being an acid pH.

    Explanation:

    PH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

    The pH scale ranges from 0 to 14. Values less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral. Mathematically, pH is the negative logarithm of the molar concentration of hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺).

    pH = - log [H⁺] = - log [H₃O⁺]

    HBr dissociates completely in water, that is, in the ionization process they are completely transformed into negative anions or ions and hydrogen ions. Then the dissociation reaction will be:

    HA + H₂O ⇒ H₃O⁺ + A⁻

    HA being a general compound. In this case:

    HBr + H₂O ⇒ H₃O⁺ + Br⁻

    Complete dissociation implies that the initial concentration of acid is equal to the final concentration of H₃O⁺. Then the pH calculation is by the following expression:

    pH = - log [H₃O⁺]

    pH = - log 0.00234 M

    pH = 2.63

    The pH value is 2.63, being an acid pH.
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