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As with any acid, that depends entirely on its concentration. The greater the concentration (until saturation) the lower the pH.

Lactic acid is a "middle of the road" weak acid; all in equal concentrations, lactic acid is stronger than citric, weaker than acetic, and about the same as formic.

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Brant Lockman

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2y ago
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15y ago

The pKa of lactic acid is 3.85, and its Ka should be 10-3.85=0.0001413. If you have not seen pKa or Ka before, that means it is a relatively weak acid since the higher the Ka, or the lower the pKa, the stronger the acid. Comparatively, acetic acid (found in vinegar) has a pKa of 4.76 and therefore is a weaker acid than lactic acid, and strong acids would have extremely high Ka's or extremely low pKa's.

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Q: What is the PH of lactic acid?
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