Considering the definition of pH, the correct answer is option D. The measured solution has a pH of 9.
But first it is necessary to know that pH is a measure of the degree of acidity or alkalinity of a substance or solution that indicates the amount of hydrogen ions present in a solution or substance.
pH is defined as the negative base 10 logarithm of the Hydrogen ion activity (that is, the H⁺ ion concentration):
pH= -log [H⁺]
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. Solutions with a pH lower than 7 are acidic, on the contrary, solutions with a pH greater than 7 are alkaline or basic. A pH value of 7 is neutral, indicating that the substance or solution is neither acidic nor alkaline.
In this case, the pH of a solution is tested, and it is found to be a basic solution. Since basic solutions must have a pH greater than 7, then the correct answer is option D. The measured solution has a pH of 9.
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