Question

A 120.0 ml buffer solution is 0.110 moll-1 in nh3 and 0.135 moll-1 in NH₄br. If the same volume of the buffer were 0.265 moll-1 in nh3 and 0.395 moll-1 in NH₄br, what mass of HCl could be handled before the pH fell below 9.00?

Answer 1

To determine the maximum amount of HCl that can be added to the buffer solution before the pH falls below 9.00, calculate the moles of NH3 and NH4Br in the buffer solution, use the Henderson-Hasselbalch equation to determine the pH, and then calculate the maximum amount of HCl.

Step-by-step explanation:

The question is asking how much mass of HCl can be added to the buffer solution before the pH drops below 9.00. To answer this question, we need to calculate the moles of NH3 and NH4Br in the buffer solution using the given concentrations and volume. Then, we use the Henderson-Hasselbalch equation to determine the pH of the buffer solution. Finally, we can calculate the maximum amount of HCl that can be added before the pH falls below 9.00.