Friday
April 18, 2014

Homework Help: Chemistry

Posted by IBY on Thursday, May 13, 2010 at 7:36am.

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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