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ch369_sp11_class_3_notes

ch369_sp11_class_3_notes - Todays plan A few more items...

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A few more items from Chapter 2 (water). A few words about proteins (topic of chapter 4 & 5). Then, start chapter 3, “From Genes to Proteins”. Today’s plan.
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Strong acids completely dissociate in water Example: HCl H + + Cl - Weak acids only partially dissociate in water.
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Example: acetic acid has a pKa of 4.7 So, in a solution of acetic acid at pH 4.7, CH 3 COOH and CH 3 COO - are present in equal amounts.
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Buffers. Buffers make solutions resistant to changes in pH. Weak acids are effective buffers at a pH that is near their pK a values. (by “near”, I mean within 1 or 2 pH units)
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pH Titration of 50 ml 0f 0.1 M acetic acid with 0.1 M NaOH. volume of 0.1 M NaOH added (ml) pK a of acetic acid = 4.7 Notice the solution is very resistant to pH changes near its pK a
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Blood pH is stabilized by a carbon dioxide - bicarbonate buffer: pKa for this buffer is about 6.4
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Choose the correct structure of aspartate at pH 7. A B C D
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Choose the correct structure of aspartate at pH 1.
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