Question 8.3: pKas . Ka for benzoic acid is 6.5 x 10^5. What is the pKa of...

pK_{a}s .   K_{a}   for benzoic acid is 6.5  \times  10^{-5}. What is the pK_{a} of this acid?

Strategy : The pK_{a}    is  -log K_{a} . Thus, use your calculator to find the log of the K_{a}   and then take the negative of it.

 

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Take the logarithm of 6.5  \times  10^{-5} on your scientific calculator. The answer is -4.19. Because pK_{a} is equal to -log K_{a} , you must multiply this value by -1 to get pK_{a} . The pK_{a} of benzoic acid is 4.19.

 

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