# Buffer Preparation with NH3 and NH4Cl

Calculate the pH for a buffer solution prepared by mixing 100. mL of 0.60 M NH3 and 200. mL of 0.45 M NH4Cl.

The Ka of NH4 + = 5.6 x 10^-10.

a) 8.65

b) 9.08

c) 9.87

d) 4.90

e) 6.62

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#### Solution Preview

We will use the famous Henderson-Hasselbalsch (H-H) equation to solve this problem. Remember, we can always use this equation when we have a simple proton donor/proton acceptor system. In this case, the proton donor is NH4Cl and the proton acceptor is NH3.

pH = pKa + log [A-]/[HA]

Since we know that the Ka of NH4+ is 5.6 x 10^-10, all we ...

#### Solution Summary

I provide a very simple to understand step by step walk-through on how to solve this problem using the Henderson-Hasselbalsch equation.

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