How would you buffer a solution that has a pH of 12?
Answer (3)
To buffer a solution at a pH of 12, use a conjugate acid-base pair such as ammonia and ammonium chloride. Initially, adjust the pH down with 0.5 M HCl and then titrate back up to pH 11 with 0.1 M NaOH, recording the data for a titration curve. ;
To buffer a solution with a pH of 12, one might typically use a combination of a weak acid and its conjugate base, or a weak base and its conjugate acid. To prepare such a buffer, one could adjust the pH downwards by adding a strong acid, such as HCl, to the solution and then readjusting the pH back to the desired level using a strong base like NaOH. This two-step process involves first driving the pH down below the target range, then slowly titrating it back up to the desired pH, ensuring that the buffer components are present in the proper ratios to resist changes in pH. Recording detailed measurements throughout this process allows for the later construction of a titration curve, which will reflect the buffer capacity and the effective pH range.
To buffer a solution with a pH of 12, use a combination of a weak base like ammonia and its conjugate acid, ammonium chloride. Add small amounts of a strong base, such as sodium hydroxide, to reach the desired pH while testing the buffer's capacity. Adjust concentrations as needed to ensure stability.
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