- Pre Lab Concentration In Buffer 2 2 Points What Is The Concentration Of The Acid Ha And Conjugate Base A7 In Your B 1 (61.83 KiB) Viewed 50 times
Post-Lab: Diluted Buffer 1/2 points After following the directions in the background and procedures, you prepare a diluted version of your buffer. Assume the pH of your diluted buffer is identical to the pH of your original buffer. Then use this pH to calculate what the pH should be after adding 0.10 M NaOH to 50 mL of the diluted buffer. (Side note: Theoretically, the diluted buffer should have the same pH as your original buffer (think about why). In reality, it may not be exactly the same, because the ionic strength of the solution changes (something you will learn more about in future courses).) The pH change after adding NaOH should be different for the dilute buffer than for the original buffer because the two solutions have different buffering capacities. Expected pH after adding 1 mL of 0.10 M NaOH to diluted buffer 9.27 Expected pH after adding 6 mL of 0.10 M NaOH to diluted buffer 8.54 Evaluate Check your calculation for the expected pH after adding 6 mL of 0.10 M NaOH to 50 mL of the diluted buffer. Do you still have a buffer anymore? Think about where you would be on a titration curve and make sure you're doing the right kind of calculation. The total volume matters.