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

AI Thread Summary
The discussion focuses on the molecular weight of potassium phosphate buffers at pH 6.8 and pH 6.4. The molecular weight of potassium phosphate (K3PO4) is confirmed to be 212.28 g/mol. It is clarified that the molecular weight does not change with pH, as pH variations do not affect the molar mass of the compound. Instead, the molar concentration of a buffer refers to the total concentration of both the acid and its conjugate base in the mixture. The conversation also highlights the importance of accurately identifying chemical formulas when discussing molecular weights.
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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.


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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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