Chemistry

posted by IBY

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.

  1. DrBob222

    Too many questions. Pick one or two that represent all the others and re-post.

  2. Anonymous

    3.7 ´ 10^-2

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