Ka from pKa

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 pKa of barbituric acid is 3.98. Determine the dissociation constant (Ka) of it.


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lb equals 1.05 × 10−4 kg

    Answer: 1.05 × 10−4 is the Ka of barbituric acid.
    • The antilog of the negative pKa would give us the Ka value.
    • The pKa provided in the question is 3.98
    • Taking negative antilog of the negative of this number we get, antilog(- 3.98) = 1.05 × 10−4
    • Hence, the pKa is 3.98


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