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08-07-2017
Chemistry

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What is the PH of the acid lactic 0,20 M?

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dec77cat dec77cat

08-07-2017

dissociation constant of lactic acid:
K=1.38·10⁻⁴

C=0.20 mol/L

[H⁺]=√(KC)

pH=-lg[H⁺]=-lg{√(KC)}

pH=-lg{√(1.38·10⁻⁴·0.20)}=2.28

pH=2.28

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