CHEM 101DL Study Guide - Midterm Guide: Ph, Benzylamine, Weak Base
26 Jun 2018
School
Department
Course
Professor
Chemistry 101DL Summer Session I, 2018
Duke University Dr. T. Woerner
Problems (Acid, Base, pH)
1. A 0.200 M solution of dichloroacetic acid, , a weak monoprotic
acid, is 33% ionized. What is the ionization constant of this acid?
2. A solution is prepared by dissolving 0.300 moles of cyanoacetic acid,
, in sufficient water to make exactly one liter of solution. The
concentration of in the resulting solution is 0.032 M. What is the ionization
constant of cyanoacetic acid?
3. In a 0.25 M solution of benzylamine, , the concentration of
is 2.4X10–3 M. What is the ionization constant for this weak base. The reaction
is given below.
+ H2O (aq) +
4. (a) What are the concentrations of , , and HOCl(aq) in a 0.2 M solution of
HOCl? Ka for HOCl = 3.5X10–8
(b) what is the degree of ionization of HOCl in this solution?
5. What are the concentrations of and in (a) a 0.020 M solution of HNO3;
and, (b) a 0.020 M solution of Ba(OH)2?
6. What pH corresponds to each of the following?
(a) [ ] = 7.3X10–5 M
C C
Cl
H
Cl
O
O H
C C
CN
H
H
O
O H
H+
(aq)
C
H
H
N
H
H
OH–
(aq)
C
H
H
N
H
H
C
H
H
N
H
H
H
+
OH–
(aq)
H+
(aq)
OCl–
(aq)
H+
(aq)
OH–
(aq)
H+
(aq)
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Document Summary
O: a 0. 200 m solution of dichloroacetic acid, What is the ionization constant of this acid: a solution is prepared by dissolving 0. 300 moles of cyanoacetic acid, , in sufficient water to make exactly one liter of solution. H concentration of constant of cyanoacetic acid? in the resulting solution is 0. 032 m. what is the ionization: in a 0. 25 m solution of benzylamine, , the concentration of is 2. 4x10 3 m. what is the ionization constant for this weak base. H (aq) ocl : (a) what are the concentrations of. Ka for hocl = 3. 5x10 8 (b) what is the degree of ionization of hocl in this solution? (aq) , and hocl(aq) in a 0. 2 m solution of: what are the concentrations of and, (b) a 0. 020 m solution of ba(oh)2, what ph corresponds to each of the following? and (aq) ] = 7. 3x10 5 m in (a) a 0. 020 m solution of hno3;
