1
(1 point) Save
Designate the conjugate Br�nsted-Lowry acid for each of the following bases: (i) NH3 (ii) CN- (iii)
NH2NH4+, H2CN, NH3
NH4+, HCN, NH3
NH3, H2CN, NH3
NH2-, HCN, NH4+
NH3, HCN, NH3
Question 2
(1 point) Save
What is the concentration of hydronium ions in a solution with a hydroxide-ion concentration of 2.31
x 10-4 M at 25�C?
4.33 x 10-11 M
2.31 x 10-4 M
2.31 x 10-18 M
2.31 x 1010 M
1.8 M
Question 3
(1 point) Save
Calculate the pH of a solution if its [OH-] = 0.0000700 M and indicate whether the solution is acidic,
basic, or neutral.
9.8, acidic
11, basic
2.15, acidic
9.8, basic
17.2, basic
Question 4 (1 point) Save
Which one of the following 0.1 M solutions would have a pH of 7.0?
NH4Cl
Cu(CH3COO)2
NaF
NaNO3
Na2S
Question 5
(1 point)
Save
If the pH of a solution is 6.30, what are the molar concentrations of H+(aq) and OH-(aq) at 25�C?
5.0 x 10-7 M and 1.0 x 10-7 M
1 x 10-7 M and 6.3 x 10-7 M
5.0 x 10-7 M and 5.0 x 10-7 M
6.3 x 10-7 M and 1.0 x 10-7 M
5.0 x 10-7 M and 2.0 x 10-8 M
Question 6
(1 point) Save
Which of the following acids, if in solutions of equal concentration, is the most acidic?
boric acid, Ka = 5.8 x 10-10
HF, Ka = 6.3 x 10-4
lactic acid, Ka = 1.4 x 10-4
acetic acid, Ka = 1.8 x 10-5
All of these acids are equally acidic because they are all of equal concentration.
Question 7
(1 point) Save
Lactic acid, HC3H5O3, has one acidic hydrogen. A 0.10 M solution of lactic acid is measured with a
pH of 2.44. Calculate Ka based on this data.
3.6 x 10-3
1.3 x 10-4
1.3 x 10-5
1.4 x 10-4
1.0 x 10-3
Question 8 (1 point) Save
Calculate the pH of the following strong acid solution: 2.02 g of HNO3 in 400 mL of solution
4
1.7
2.3
1.5
1.1
Question 9 (1 point)
Which of the following statements is false?
Save
A Lewis acid does not have to contain a proton.
An Arrhenius acid is a proton acceptor
Metal ions show acidic properties.
A Lewis base is an electron pair donor.
Salts dissolve in water due to the attraction of the positive ions for water molecules.
Question 10
Given the following Ka values, HC2H3O2 Ka = 1.8 x 10-5
HClO3 Ka = 5.0 x 10^2
HCN Ka = 4.9 x 10-10
HF Ka = 6.8 x 10-4
HOCl Ka = 3.0 x 10-8
which of the following is the weakest base?
(1 point)
Save
CNClO3OClC2H3O2F-