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Chapter 20: Q39P (page 678)
Calculate the Ka's for the following acids:
(a) Citric acid, pKa = 3.14
(b) Tartaric acid, pKa = 2.98
Thevalue of Ka for citric and tartaric acid were calculated.
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In humans, the final product of purine degradation from DNA is uricacid, pKa = 5.61, which is excreted in the urine. What is the percent dissociation of uric acid in urine at a typical pH = 6.0? Why do you think uric acid is acidic even though it does not have a CO₂H group?
Calculate the percentages of dissociated and undissociated forms present in the following solutions:
(a) glycolic acid (;) at
(b) propanoic acid ( ) at
How might you prepare 2-phenylethanol from benzyl bromide? More than one step is needed.
Which method – Grignard carboxylation or nitrile hydrolysis would you use for each of the following reactions? Explain.
How would you prepare the following carboxylic acids?
(a)
(b)
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