Determine pKa from Ka

8. Buffer and Isotonic Solution 8.1) Buffer 8.1.1) Determine pKa from Ka

8.1.1.1) Determine pKa from Ka Easy 1


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The dissociation constant (Ka value) of mandelic acid is 4.29 × 10−4. Determine the pKa of it.


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lb equals 3.37 kg

    Answer: 3.37 is the pKa of mandelic acid.
    • The negative logarithm of Ka would give us the pKa value.
    • The Ka provided in the question is 4.29 × 10−4
    • Taking negative log of this number we get, —log( 4.29 × 10−4) or — (— 3.37) or 3.37
    • Hence, the pKa is 3.37