Answer:
7.76 x 10^-3 M
Explanation:
pH = -log(x)
2.11 = -log (x)
10^-2.11 = 7.76x10^-3 M
Considering the definition of pH, the concentration [H⁺] is 7.76×10⁻³ M
You need to know that 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⁺]
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.
In this case, being pH= 2.11, you can replace this value in the definition of pH:
2.11= -log [H⁺]
Solving:
[H⁺]= 10⁻² ¹¹ M
[H⁺]= 7.76×10⁻³ M
Finally, the concentration [H⁺] is 7.76×10⁻³ M
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