Shown below is the titration curve for phosphoric acid. At what pH is it entirely in the PO43 form? Phosphate Titration 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Equivalents OH O 0.6 O 2.1 O 4.5 O 7.2 O 9.6 O 12.5 O 14

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QUESTION 4
1
The table below shows the pKa values for the various functional groups on cysteine. In which of the
following forms will cysteine predominantly be found at pH 9.1?
group
pKa
carboxyl (-COOH)
1.96
sulfhydryl (-SH)
8.18
ammonium (-NH3")
10.13
А.
В.
CH,- SH
CH,- SH
H,N - CH- COOH
H,N- CH-COO*
С.
D.
CH,-S
CH,-S
H,N - CH-COO*
H,N CH- COO
O A
O B
ОС
O D
Transcribed Image Text:QUESTION 4 1 The table below shows the pKa values for the various functional groups on cysteine. In which of the following forms will cysteine predominantly be found at pH 9.1? group pKa carboxyl (-COOH) 1.96 sulfhydryl (-SH) 8.18 ammonium (-NH3") 10.13 А. В. CH,- SH CH,- SH H,N - CH- COOH H,N- CH-COO* С. D. CH,-S CH,-S H,N - CH-COO* H,N CH- COO O A O B ОС O D
QUESTION 5
Shown below is the titration curve for phosphoric acid. At what pH is it entirely in the PO43- form?
Phosphate Titration
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Equivalents OH
O 0.6
O 2.1
O 4.5
O 7.2
O 9.6
O 12.5
O 14
Hd
Transcribed Image Text:QUESTION 5 Shown below is the titration curve for phosphoric acid. At what pH is it entirely in the PO43- form? Phosphate Titration 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Equivalents OH O 0.6 O 2.1 O 4.5 O 7.2 O 9.6 O 12.5 O 14 Hd
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