To do this, we use the Henderson-Hasselbalch equation, which is given by:
\[pH = pKa + log\left(\frac{[Base]}{[Acid]}\right)\]
In this case, the base is NH3 and the acid is NH4Cl. The Kb value for NH3 is given as 1.76 x 10^-5. We can convert this to a Ka value
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