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Equilibrium and pH Questions

  1. Apr 8, 2014 #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!
  2. jcsd
  3. Apr 8, 2014 #2
    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.

  4. Apr 9, 2014 #3


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    Staff: Mentor

    Perhaps you were given a pKa table? Or there is one in your book?
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