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
Total tried: Correct: Wrong:
The pKa of benzoic acid is 4.2. Determine the dissociation constant (Ka) of it.
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lb equals 6.3 × 10−5 kg
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Answer: 6.3 × 10−5 is the Ka of benzoic acid.
- The antilog of the negative pKa would give us the Ka value.
- The pKa provided in the question is 4.2
- Taking negative antilog of the negative of this number we get, antilog(- 4.2) = 6.30 × 10−5
- Hence, the pKa is 4.2