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Equilibrium and pH Questions

by Dpasi314
Tags: equilibrium
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Apr8-14, 08:56 PM
P: 1
So as the end of the year comes to an end, AP Chemistry is getting increasingly more difficult to the point where I don't understand anymore. In our homework there is a questions asking to calculate the pH of a buffered solution. The only information it gives you is the chemical formula and the molarity. i.e
Calculate the pH of each of the following buffered solutions:
a. 0.50 M C2H5NH2/0.25 M C2H5NH3Cl

I'm not quite sure how I'm suppose to be able to figure out the pH without having a Ka/Kb value given? Is the question assuming that I need to know what the Ka/Kb value? Or am I missing something entirely?

Thanks for the help!
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Apr8-14, 10:16 PM
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Chestermiller's Avatar
P: 5,237
Hi Dpasi314. Welcome to Physics Forums.

Do you know the name of the 0.5 M species? If so, have you tried Googling it? It should take less than a minute to find the Kb.

Apr9-14, 02:24 AM
Borek's Avatar
P: 23,577
Perhaps you were given a pKa table? Or there is one in your book?

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