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Molecular Weight Question

  1. Mar 29, 2005 #1
    What is the molecular weight of potassium phosphate buffer pH 6.8 and pH 6.4? I tried to find the answer but no luck. Please help calculate. Thank you. :bugeye:
  2. jcsd
  3. Mar 29, 2005 #2
    K+ PO3(4-) MW: 212.28 ...... am I missing something here? how does mw change as pH changes?
  4. Mar 29, 2005 #3


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    Staff Emeritus
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    It does not...and while you have the corrrect MW it looks like you may have mistyped the formula for [itex]K_3PO_4 [/itex]
  5. Mar 30, 2005 #4


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    Staff: Mentor

    Buffers are mixtures so there is no such thing as molar mass. Molar concentration of buffer refers to the total concentration of both acid and conjugated base.

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  6. Mar 30, 2005 #5
    yes, I realized that.
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