J.R. S. answered • 09/30/17
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The difference between the two is that aspirin is salicylic acid with the free OH of salicylic acid having been esterified. Both compounds still have the -COOH group. So, it comes down to comparing -OH to -OC=OCH3. The -OH group is more polar than the ester so salicylic acid is more polar than aspirin.
