Since the pH of this unknown solution is equal to 13.5, the true statement is that: A. the solution is a strong base.
What is pH?
pH is simply an abbreviation for the power of hydrogen ions and it can be defined as a measure of the molar concentration of hydrogen ions in a particular solution.
This ultimately implies that, a pH can be used to measure and specify the acidity, neutrality or basicity (alkalinity) of any chemical solution.
On a pH scale, a chemical solution with a pH of 7 is said to be neutral, a chemical solution with a pH below 7 is acidic and it's basic (alkaline) when it's pH is above 7.
In conclusion, we can infer and logically deduce that this solution is a strong base because its pH is equal to 13.5.
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