Buffers A2 help!
Calculate the pH of the buffer solution formed when 10.00 cm3 of
0.100 mol dm–3 potassium hydroxide are added to 25.00 cm3 of 0.410 mol dm–3 ethanoic acid
Jan 2010.
I got a ph of 4.80, but the answer is 3.79. I calculated it correct up to the point of the equation, and I am still confused as to why you do no need to calculate the new CONCENTRATIONS by dividing by the new total volume of 35cm^3
Why do you find new concentrations by dividing by the total volume and when do you not?
0.100 mol dm–3 potassium hydroxide are added to 25.00 cm3 of 0.410 mol dm–3 ethanoic acid
Jan 2010.
I got a ph of 4.80, but the answer is 3.79. I calculated it correct up to the point of the equation, and I am still confused as to why you do no need to calculate the new CONCENTRATIONS by dividing by the new total volume of 35cm^3
Why do you find new concentrations by dividing by the total volume and when do you not?
What is the Ka value
Posted from TSR Mobile
Posted from TSR Mobile
I got the right answer by your method?
Posted from TSR Mobile
Posted from TSR Mobile
Original post by cutelady
Did you find new concentrations by dividing by volumes?
When are you supposed to divide by volumes? THats what is really confusing me!
1) find the moles of KOH
2 find the moles of ethanoic acid
3) find what's in excess, in this case ethanoic acid was in excess.
4) find the new concentrations, by doing MOLES multiply by 1000 and divide by 35.
5) rearrange the equation to find [H+]
6) find the pH
7) would give you the right answer
Posted from TSR Mobile
2 find the moles of ethanoic acid
3) find what's in excess, in this case ethanoic acid was in excess.
4) find the new concentrations, by doing MOLES multiply by 1000 and divide by 35.
5) rearrange the equation to find [H+]
6) find the pH
7) would give you the right answer
Posted from TSR Mobile
Original post by cutelady
1) find the moles of KOH
2 find the moles of ethanoic acid
3) find what's in excess, in this case ethanoic acid was in excess.
4) find the new concentrations, by doing MOLES multiply by 1000 and divide by 35.
5) rearrange the equation to find [H+]
6) find the pH
7) would give you the right answer
Posted from TSR Mobile
2 find the moles of ethanoic acid
3) find what's in excess, in this case ethanoic acid was in excess.
4) find the new concentrations, by doing MOLES multiply by 1000 and divide by 35.
5) rearrange the equation to find [H+]
6) find the pH
7) would give you the right answer
Posted from TSR Mobile
Thats perfect, thank you so much
Original post by soLit
Thats perfect, thank you so much
Welcome xx
Posted from TSR Mobile
Quick Reply
Related discussions
- Problem with buffers in A2 Chemistry
- alevel Chem Topics with most marks
- Buffer solution help!!
- A level chemistry help URGENT ‼️
- Chem help
- chemistry help for a level ocr
- Question about negative control pcr test!!!
- Chem a level buffers question
- Can someone please help me with this question about buffers?
- Buffer calculation help
- Buffer calculation question A level chemistry help
- chemistry pH question HELP
- Buffer lost
- Weak acid+alkali
- Newton Europe selection day
- AQA A Level Chemistry Acids and bases
- Chemistry a level buffers questions
- ATAS Website Slow
- biology dna
- Biology enzymes question
Latest
Last reply 9 minutes ago
Official Cambridge Postgraduate Applicants 2024 ThreadLast reply 24 minutes ago
Official University College London Applicant Thread for 2024Last reply 30 minutes ago
AQA GCSE English Literature Paper 1 (8702/1) - 13th May 2024 [Exam Chat]Last reply 51 minutes ago
Official: University of Bristol A100 2024 Entry ApplicantsLast reply 1 hour ago
2023 ** Borders and Enforcement, Crime & Compliance - ICE - Immigration OfficersLast reply 1 hour ago
Official University of Edinburgh Applicant Thread for 2024Last reply 2 hours ago
Can I do economics degree without a level maths?Last reply 2 hours ago
BAE systems degree apprenticeships September 2024Last reply 2 hours ago
Government Social Research Placement interview questions
