you have been asked to identify a compound which is known to have an ionisable groups with a pka of 10.33, and one other ionisable group with a pka between 5 and 7. to 100mL of a 2.0M solution of this compound at a pH of 9.5 was added 40mL of a solution of 0.2MHCl acid. the pH changed to 6.85
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