Considering the definition of pH, the hydronium ion concentration [H₃O⁺] of the solution is 1×10⁻³ M.
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⁺]
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.
Hydronium ion concentration
In this case, being pH= 3, you can replace this value in the definition of pH:
3= -log [H₃O⁺]
Solving:
[H₃O⁺]= 10⁻³ M
[H₃O⁺]= 1×10⁻³ M
Finally, the hydronium ion concentration [H₃O⁺] of the solution is 1×10⁻³ M.
Learn more about pH:
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