Your friend tells you that the pH of a solution of a strong acid must be lower than the pH of a solution of a weak acid. This statement is incorrect.
The pH of a stronger acid is supposed to be greater then the pH of a weaker acid.
On a pH scale from 1 to 14, the pH value less than 7 indicates the acidity while the pH value greater than 7 shows the substance is basic in nature.
The pH of a stronger acid is about 0-2.
Simply put, the less the pH value, greater the number of hydrogen ions and stronger the acid.
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