
Concept explainers
Interpretation:
The pH of a 2.5 M HCl solution needs to be calculated.
Concept Introduction:
The acidity of a solution is expressed in terms of its pH which is essentially the measure of the hydrogen ion (H+) concentration of that solution. Mathematically,
If the pH is below 7 the solution is termed as acidic, if greater than 7 the solution is basic. A neutral solution will have a pH = 7.

Answer to Problem 7E
pH = -0.40
Explanation of Solution
The concentration of HCl solution is given 2.5 M
Since, HCl is a strong acid, the H+ ion concentration would be 2.5 M
The pH of solution can be calculated as follows:
Thus, the pH of a 2.5 M HCl solution is -0.40.
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