ThepHofasampleofbloodis7.4;thepHofasampleof.pptVIP

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2017-05-16 发布于湖北
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ThepHofasampleofbloodis7.4;thepHofasampleof.ppt

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ThepHofasampleofbloodis7.4;thepHofasampleof

The pH of a sample of blood is 7.4; the pH of a sample of gastric juice is 1.4. The blood sample has: A. 5.29 times lower [H+] than the gastric juice B. A million times higher [H+] than the gastric juice C. 6000 times lower [H+] than the gastric juice D. A million times lower [H+] than the gastric juice E. 0.189 times the [H+] as the gastric juice The pH of a sample of blood is 7.4; the pH of a sample of gastric juice is 1.4. The blood sample has: A. 5.29 times lower [H+] than the gastric juice B. A million times higher [H+] than the gastric juice C. 6000 times lower [H+] than the gastric juice D. A million times lower [H+] than the gastric juice * E. 0.189 times the [H+] as the gastric juice WEAK acids and bases in biochemistry… Tendency of an acid to dissociate HA-- H+ + A- is described by Ka = ([H+][A-])/[HA] pKa = -log Ka (proton donor) (proton acceptor) WEAK acids and bases in biochemistry… Tendency of an acid to dissociate HA- H+ + A- is described by Ka = ([H+][A-])/[HA] pKa = -log Ka (proton donor) (proton acceptor) High Ka, low pKa Low Ka, high pKa Conjugate acid-base pair Formic acid has a pKa of 3.75; acetic acid has a pKa of 4.76. -Which is the stronger acid? -Does the stronger acid have a greater or lesser tendency to lose its proton than the weaker acid? -DRAW the titration curves of formic and acetic acids, on one graph. -At a solution pH of 4.76, what can you say about the concentrations of acetic acid (CH3COOH) and acetate (CH3COO-) present? ? ? ? ? Formic acid has a pKa of 3.75; acetic acid has a pKa of 4.76. -Which is the stronger acid? -Does the stronger acid have a greater or lesser tendency to lose its proton than the weaker acid? Formic acid is the stronger acid. It has a greater tendency to lose its proton than acetic acid; it wants to give away its proton. -DRAW the titration curves of formic and acetic acids, on one graph. (small gr