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

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.