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September 3, 2015

Homework Help: Chemistry

Posted by wite2khin on Thursday, May 13, 2010 at 5:26pm.

0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 * 10^-4 M. What is the equilibrium constant, Ka, for this acid?



a. 5.0 *10^-2

b. 5.0 * 10^-3

c. 2.5 * 10^-4

d. 2.5 * 10^-5

e. 2.5 * 10^-6




2. (Points: 1)
What is the carbonate-ion, CO3^-2, concentration in a 0.037 M carbonic acid solution?



a. 1.2 10^-4

b. 4.2 10^-7

c. 7.6 10^-8

d. 4.8 10^-11

e. 5.2 10^-19

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