Consider a room temperature 0.30M ammonia buffer at pH 9.5. As you raise the temperature of the buffer, would you expect the pH to change? Explain. (Pka of NH4+ is 9.26)
I would consider two things:
a. Look at the Nernst equation. It has Eo-(RT/NF)log..... term in it and the T changes that.
b. Would the solution be likely to lose NH3 as the temperature increases.