Homework Help: Chemistry

Posted by Iby on Thursday, May 13, 2010 at 5:24pm.

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

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