395GLec03_09 - Lecture 2 Outline Chapter 2 Aqueous...

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Lecture 2 Outline Chapter 2 Aqueous solutions Acids and Bases pH Henderson Hasselbalch Chapter 4 Amino Acids and Peptides Structure Chirality Non-protein amino acids Peptide bond
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What is the typical molarity of the H + for maximal activity in animal tissues?
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i.e. ~ pH 7 However a few physiological surroundings are far from neutrality. Name one: Stomach Contents
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Acid K a p K a HCOOH (formic) 1.8 x 10 -4 3.75 H OOH (acetic) .74 x 10 .76 Dissociation of common acids CH 3 COOH (acetic) 1.74 x 10 -5 4.76 H 3 PO 4 (phosphoric) 7.25 x 10 -3 2.14 NH 4 + (ammonium) 5.62 x 10 -10 9.25
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It is important to note that all of the pK values we have talked about refer to measurements carried out in water. In biological systems not all of the reactants operate in a purely aqueous environment.
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Box 2-B Acid-base balance in humans.
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( bottom ) Dissociation Constants and p K ’s at 25°C of Some Acids in Common Laboratory Use as Biochemical Buffers . Page 45
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395GLec03_09 - Lecture 2 Outline Chapter 2 Aqueous...

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