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Posted by on Thursday, April 14, 2011 at 8:11am.

Lactic acid, C3H6O3, is found in sour milk. A solution containing 1.00g NaC3H5O3 in 100.0mL of 0.0500M C3H6O3 has a pH= 4.11.

Calculate the Ka of lactic acid

  • chemistry - , Thursday, April 14, 2011 at 4:07pm

    Let lactic acid = HL
    The salt, then, is NaL.
    I would use the Henderson-Hasselbalch equation but it can be done without that.
    Substitute 4.11 for pH.
    (base) in the HH equation = 1g/molar mass NaL.
    (acid) in the HH equation = 0.05
    Solve for pKa and convert to Ka.

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