## Molecular Weight Question

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.
 K+ PO3(4-) MW: 212.28 ...... am I missing something here? how does mw change as pH changes?
 Recognitions: Gold Member Science Advisor Staff Emeritus It does not...and while you have the corrrect MW it looks like you may have mistyped the formula for $K_3PO_4$

## Molecular Weight Question

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.

Best,
Borek
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 Quote by Gokul43201 It does not...and while you have the corrrect MW it looks like you may have mistyped the formula for $K_3PO_4$
yes, I realized that.