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Calculating pH
The pH of a substance is defined by:
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where the quantity [H+] represents the concentration of hydrogen ions, measured in moles per liter, in the substance.
- A substance with a pH < 7 is considered an acid
- A substances with a pH > 7 is considered a base
Find the pH of milk whose concentration of hydrogen ions, [H+] = 4 x 10-7 moles/liter.
Solution #1:
Using pH = −log[H+]:
pH = −log(4 x 10-7)
pH ≈ −(−6.4)
pH ≈ 6.4
Example #2:
Solution #2:
3.1 = −log[H+]
Multiplying each side by −1:
−3.1 = log[H+]
Raising both sides to power of 10:
10−3.1 = [H+]
[H+] ≈ 7.94 x 10-4 moles/liter
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