Asked by Ethio
Calculate z pH of a buffer solun containing o.1 M acetic acid & 0.1 M solun of sodiumacetate when 1 mL of 0.1M HCl is added to 100 mL of buffer .
Answers
Answered by
DrBob222
100 mL buffer x 0.1M CH3COOH = 10 mmoles.
100 mL buffer x 0.1M CH3COONa = 10 mmoles.
add 1 mL x 0.1M HCl = 0.1mmole.
Let's call acetic acid, CH3COOH, HAc.
...........Ac^- + H^+ ==> HAc
initial.....10.....0.......10
add...............0.1..............
change.....-0.1..-0.1.....+0.1
equil.......9.9.....0.....10.1
Plug into the Henderson-Hasselbalch equation and solve for pH. Using 1.75E-5 for Ka I obtained a little over 4.7 but you need to do it more accurately AND your text/notes may list a different value for Ka.
100 mL buffer x 0.1M CH3COONa = 10 mmoles.
add 1 mL x 0.1M HCl = 0.1mmole.
Let's call acetic acid, CH3COOH, HAc.
...........Ac^- + H^+ ==> HAc
initial.....10.....0.......10
add...............0.1..............
change.....-0.1..-0.1.....+0.1
equil.......9.9.....0.....10.1
Plug into the Henderson-Hasselbalch equation and solve for pH. Using 1.75E-5 for Ka I obtained a little over 4.7 but you need to do it more accurately AND your text/notes may list a different value for Ka.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.