Problem: You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.Which solutions would you use?

FREE Expert Solution

We’re asked to determine which of the following solutions to use in order to prepare a buffer with a pH of 3.60


Recall that a buffer can be composed of the following:


• weak base and its conjugate acid
 • 
weak acid and its conjugate base
 • 
weak acid and a strong base 

 concentration of weak acid > concentration of strong base

• weak base and a strong acid 

concentration of weak base > concentration of strong acid


Also, recall that we can solve for the pH of a buffer solution using the Henderson-Hasselbalch equation:


pH=pKa+logconjugate baseweak acid


Therefore, we have to look for a combination of solutions that make a buffer with a pH close to 3.60.


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Problem Details

You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.

Which solutions would you use?