We're being asked to identify which of the given acids has the weakest conjugate base.
Recall: The stronger an acid, the weaker its conjugate base, and, conversely, the stronger a base, the weaker its conjugate acid
We need to identify the strongest acid among the given. We can compare their Ka values:
Which of the following acids has the weakest conjugate base?
a. 3-chlorobenzoic acid, Ka = 1.5x10-4
b. hypochlorous acid, Ka = 2.9x10-8
c. formic acid, Ka = 1.86x10-4
d. chloroacetic acid, Ka = 1.26x10-3
e. nitrous acid, Ka = 4.5x10-4
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