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Homework Help: How to prepare 50mM Na2HPO4/H3PO4 buffer, pH 4.5

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  1. Oct 17, 2016 #1
    The have to prepare the buffer but I really don't know how. Is the any formular for the buffer preparation?

    Ps. Sorry but one more thing, what does the "/" between Na2HPO4 and H3PO4 mean?
     
  2. jcsd
  3. Oct 17, 2016 #2

    Borek

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    Staff: Mentor

    / means buffer containing both Na2HPO4 and H3PO4.

    I strongly suggest you start by reading about buffer solutions, for example here: https://en.wikipedia.org/wiki/Buffer_solution (but there are plenty of other resources on the web).

    For pH 4.5 this is a very bad buffer choice.

    Sorry to say that, but from the way you asked the question it is clear you are not qualified for the task.
     
  4. Oct 17, 2016 #3
    So, I have to prepare H3PO4 and then add NaOH?

    H3PO4 + 2NaOH ---> Na2HPO4 + 2H2O

    Am I correct?
     
  5. Oct 17, 2016 #4

    Borek

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    Staff: Mentor

    This is one of ways of doing it. You can as well mix the acid and the salt solution.
     
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