(c) *A 0.100 M aqueous solution of methylamine (CH3NH2) was prepared for use in HPLC analysis of a mixture. The analysis however depends on the pH of the solution. To adjust the pH of the 0.100 M methylamine solution, a 5.00 mL of 0.100 M acetic acid (CH3C00H) was added to a 250. mL of the methylamine solution. The dissociation processes for methylamine and acetic acid are as follows: CH3NH2(aq) H20() CH3NH3 + OH (aq) CH3COOH(aq) + H20() H30 + CH3CO0 (aq) Ke 4.4 x 10 Ke 1.76 x 105 Use the information to determine the following: 1. pH of the methylamine solution before the acetic acid was added; CH3NH2 H20 CH3 NH 3t Ot + COH J G 63 xio - I -1ogCor POH (Oh -og (G63 xio)2 O- 2.18 CCHNHECOH pH=14- Ke= -4 4.4X10 Ccx) 0.1-2 1I0 = 182 // CH3NH2 +.4 x1 0 O 4.4x10 2 hor: = 0.006633 ii. percentage ionization of methylamine before the acetic was added; 6.63x10 = 6.63 % TITTH 11 x100 ii. the adjusted pH of methylamine when the acetic acid was added. 0A5)3100 53
(c) *A 0.100 M aqueous solution of methylamine (CH3NH2) was prepared for use in HPLC analysis of a mixture. The analysis however depends on the pH of the solution. To adjust the pH of the 0.100 M methylamine solution, a 5.00 mL of 0.100 M acetic acid (CH3C00H) was added to a 250. mL of the methylamine solution. The dissociation processes for methylamine and acetic acid are as follows: CH3NH2(aq) H20() CH3NH3 + OH (aq) CH3COOH(aq) + H20() H30 + CH3CO0 (aq) Ke 4.4 x 10 Ke 1.76 x 105 Use the information to determine the following: 1. pH of the methylamine solution before the acetic acid was added; CH3NH2 H20 CH3 NH 3t Ot + COH J G 63 xio - I -1ogCor POH (Oh -og (G63 xio)2 O- 2.18 CCHNHECOH pH=14- Ke= -4 4.4X10 Ccx) 0.1-2 1I0 = 182 // CH3NH2 +.4 x1 0 O 4.4x10 2 hor: = 0.006633 ii. percentage ionization of methylamine before the acetic was added; 6.63x10 = 6.63 % TITTH 11 x100 ii. the adjusted pH of methylamine when the acetic acid was added. 0A5)3100 53
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Please check my answers and help me with question iii.
Transcribed Image Text:(c) *A 0.100 M aqueous solution of methylamine (CH3NH2) was prepared for use in HPLC analysis
of a mixture. The analysis however depends on the pH of the solution. To adjust the pH of the
0.100 M methylamine solution, a 5.00 mL of 0.100 M acetic acid (CH3C00H) was added to a
250. mL of the methylamine solution. The dissociation processes for methylamine and acetic
acid are as follows:
CH3NH2(aq) H20() CH3NH3 + OH (aq)
CH3COOH(aq) + H20() H30 + CH3CO0 (aq)
Ke 4.4 x 10
Ke 1.76 x 105
Use the information to determine the following:
1. pH of the methylamine solution before the acetic acid was added;
CH3NH2 H20 CH3 NH 3t Ot
+
COH J G 63 xio
-
I
-1ogCor
POH
(Oh
-og (G63 xio)2
O-
2.18
CCHNHECOH
pH=14-
Ke=
-4
4.4X10
Ccx)
0.1-2
1I0
= 182 //
CH3NH2
+.4 x1
0
O
4.4x10
2
hor:
= 0.006633
ii. percentage ionization of methylamine before the acetic was added;
6.63x10
= 6.63 %
TITTH
11
x100
ii. the adjusted pH of methylamine when the acetic acid was added.
0A5)3100
53
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