Calculate the pH of two buffer systems to compare the differences in pH. One contains 1.0 M NH3 and 3.0 M NH4Cl. (Ka of NH4+, is 5.6x10^-10). The other contains 1.0 M NH3 and 5.0 M NH4Cl. (Ka of NH4+, is 5.6x10^-10).

Question

Calculate the pH of two buffer systems to compare the differences in pH.  One contains 1.0 M NH3 and 3.0 M NH4Cl. (Ka of NH4+, is 5.6x10^-10).  The other contains 1.0 M NH3 and 5.0 M NH4Cl. (Ka of NH4+, is 5.6x10^-10).

DrBob222 · Answer

It's just a matter of substituting into the Henderson-Hasselbalch equation. pH = pKa + log[(base)/(acid)] Convert Ka to pKa by pKa = -log Ka

Natalea · Answer

Thank you!