Which of the following can we predict from an equilibrium constant for a reaction?
1 The extent of a reaction
2 Whether the reaction is fast or slow
3 Whether a reaction is exothermic or endothermic
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2 only
e. 1 and 3 only
2. (Points: 1)
Carbonic acid is a diprotic acid, H2CO3, with Ka1 = 4.2 ´ 10-7 and Ka2 = 4.8 ´ 10-11. The ion product for water is Kw = 1.0 ´ 10-14.
What is the H3O+ concentration in a saturated carbonic acid solution that is 0.037 molar?
a. 3.7 ´ 10^-2
b. 7.4 ´ 10^-2
c. 6.5 ´ 10^-4
d. 1.2 ´ 10^-4
e. 4.2 ´ 10^-7
3. (Points: 1)
When all the following solutes act as acids, the one with the weakest conjugate base is
a. H2SO3.
b. H2CO3.
c. HClO4.
d. HClO.
e. HF.
4. (Points: 1)
A sample of ammonia (Kb = 1.8 * 10^-5) is titrated with 0.1 M H2SO4. At the equivalence point, the pH is approximately
a. 1.
b. 5.
c. 7.
d. 9.
e. 11.
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