...provide selection A,B,C, etc..)? A weak monoprotic acid is 0.50% ionized in a 1.0 M solution. The dissociation constant of the weak acid is
a. 5.0 ´ 10-1.
b. 5.0 ´ 10-3.
c. 2.5 ´ 10-5.
d. 2.5 ´ 10-6.
e. 2.5 ´ 10-7.
2.
Calculate the pH of a 0.25 M HF solution that is 5.2% ionized (Ka = 6.8 ´ 10-4).
a. 1.79
b. 1.85
c. 1.89
d. 1.95
e. 1.99
3.
Calculate Kb for the cyanide ion, CN- (the hydrolysis constant). (Ka for HCN = 4.9 ´ 10-10.)
a. 5.6 ´ 10-10
b. 4.0 ´ 10-10
c. 1.0 ´ 10-7
d. 2.0 ´ 10-5
e. 2.0 ´ 109
4. (Points: 1)
What is the pH of a 0.2 M solution of sodium propionate, NaC3H5O2? (For propionic acid, HC3H5O2, Ka = 1.3 ´ 10-5.)
a. 4.9
b. 7.7
c. 9.1
d. 8.4
e. 11.1
a. 5.0 ´ 10-1.
b. 5.0 ´ 10-3.
c. 2.5 ´ 10-5.
d. 2.5 ´ 10-6.
e. 2.5 ´ 10-7.
2.
Calculate the pH of a 0.25 M HF solution that is 5.2% ionized (Ka = 6.8 ´ 10-4).
a. 1.79
b. 1.85
c. 1.89
d. 1.95
e. 1.99
3.
Calculate Kb for the cyanide ion, CN- (the hydrolysis constant). (Ka for HCN = 4.9 ´ 10-10.)
a. 5.6 ´ 10-10
b. 4.0 ´ 10-10
c. 1.0 ´ 10-7
d. 2.0 ´ 10-5
e. 2.0 ´ 109
4. (Points: 1)
What is the pH of a 0.2 M solution of sodium propionate, NaC3H5O2? (For propionic acid, HC3H5O2, Ka = 1.3 ´ 10-5.)
a. 4.9
b. 7.7
c. 9.1
d. 8.4
e. 11.1