Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
Definition of pH
pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]= - log [H₃O⁺]
Numerical scale of pH
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
pH in this case
In this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.
Replacing in the definition of pH:
pH= -log (3.4×10⁻¹¹ M)
Solving:
pH= 10.47
Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
Learn more about pH:
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