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 formic acid is 1.76 × 10−4. Determine the pKa of it.


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lb equals 3.75 kg

    Answer: 3.75 is the pKa of formic acid.
    • The negative logarithm of Ka would give us the pKa value.
    • The Ka provided in the question is 1.76 × 10−4
    • Taking negative log of this number we get, —log( 1.76 × 10−4) or — (— 3.75) or 3.75
    • Hence, the pKa is 3.75


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