Shown below is the titration curve for the amino acid glycine (side chain -H). What is the composition of glycine at pH 10.0? 12 10 H,NCH,CO0 +H* pK2 H,NCH,Coo 8 pH 6 4 pk, 2 H,NCH,COOH H,ÑCH,coo +H* 0.5 1.0 H+ ions dissociated/molecule 1.5 2.0 O 100% H3N*-CH2-COO O50% H3N*-CH2-COO"; 50% H2N-CH2-COO" D 50% H2N-CH2-COOH; 50% H2N-CH2-COO" 100% H2N-CH2-COOH

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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QUESTION 4
Shown below is the titration curve for the amino acid glycine (side chain -H). What is the composition of glycine at pH 10.0?
12
10
pK2
H2NCH,CO0 +H*
H,NCH,CO0
8
pH 6
4 -
pK,
H,NCH,COOH H,ÑCH,co0 + H*
0.5
1.0
H+ ions dissociated/molecule
1.5
2.0
O 100% H3N*-CH2-CO
O 50% H3N*-CH2-COO"; 50% H2N-CH2-COO"
O 50% H2N-CH2-COOH; 50% H2N-CH2-CO",
O 100% H2N-CH2-COOH
Transcribed Image Text:QUESTION 4 Shown below is the titration curve for the amino acid glycine (side chain -H). What is the composition of glycine at pH 10.0? 12 10 pK2 H2NCH,CO0 +H* H,NCH,CO0 8 pH 6 4 - pK, H,NCH,COOH H,ÑCH,co0 + H* 0.5 1.0 H+ ions dissociated/molecule 1.5 2.0 O 100% H3N*-CH2-CO O 50% H3N*-CH2-COO"; 50% H2N-CH2-COO" O 50% H2N-CH2-COOH; 50% H2N-CH2-CO", O 100% H2N-CH2-COOH
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