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Introduction to General, Organic and Biochemistry
11th Edition
ISBN: 9781285869759
Author: Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher: Cengage Learning
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What is the conjugate acid of acetamide and its pka value?
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- The pKa of acetamide (CH3CONH2) is 16. Draw the structure for its conjugate base and explain why acetamide is less acidic than CH3COOH.arrow_forwardThe pkb of methylamine, CH3NH2, is 3.36. Calculate the pka of its conjugate acid, CH3NH3*. pka =arrow_forwardwhat is the structure of o-methylphenoxide anion and what is its pKa?arrow_forward
- The pKa of the conjugate acid of guanidine is 13.6, making it one of thestrongest neutral organic bases. Offer an explanation.arrow_forwardCompounds like amphetamine that contain nitrogen atoms are protonated by the HCl in the gastric juices of the stomach, and the resulting salt is then deprotonated in the basic environment of the intestines to regenerate the neutral form. Write proton transfer reactions for both of these processes.arrow_forwardWhy is methyl salicylate so easily absorbed through the skin?arrow_forward
- What is the role of phenolphthalein in the neutralization reaction? Draw the structure of phenolphthalein under acidic and basic conditions.arrow_forwardWhy is imidazole a stronger acid (pKa = 14.4) than pyrrole (pKa ~ 17)?arrow_forward16-26 The p/fb of amphetamine is approximately 3.2 Amphetamine (a) Which form of amphetamine (the free base or its conjugate acid) would you expect to be present at pH 1.0, the pH of stomach acid? (b ) Which form of amphetamine would you expect to be present at pH 7.40, the pH of blood plasma?arrow_forward
- The following pKa values have been measured. Explain why a hydroxyl group in the para position decreases the acidity while a hydroxyl group in the meta position increases the acidity.arrow_forward4 (Chemical Connections 19F) Why do Lactomer stitches dissolve within 2 to 3 weeks following surgery?arrow_forwardCalculate the Ka's for the following acids: (a) Citric acid, pKa = 3.14 (b) Tartaric acid, pKa = 2.98arrow_forward
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