What is the Molecular Weight of Potassium Phosphate Buffer at pH 6.8 and 6.4?

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SUMMARY

The molecular weight of potassium phosphate buffer (K3PO4) is 212.28 g/mol, which remains constant regardless of pH changes, specifically at pH 6.8 and pH 6.4. The discussion clarifies that while the molecular weight is fixed, the concept of molar concentration in buffers refers to the total concentration of both the acid and its conjugate base. Misunderstandings regarding the formula and the nature of buffers were addressed, emphasizing the importance of correct chemical notation.

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


Chemical calculators for labs and education
BATE - pH calculations, titration curves, hydrolisis
 
Gokul43201 said:
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.
 

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