Acids and Bases - Buffer Solution Calculation Question Walkthrough｜A Level Chemistry Revision

Ace your A Level Chemistry exams with this in-depth analysis of a past paper question. I break down the complexities and guide you through every step to ensure you understand and can replicate them in your revision and exams.
This video is intended to be an ultimate guide on how to answer a acids and bases buffer solution calculation question under the acids and bases topic.
This 5-mark question focuses on adding a strong base (alkali) to a solution of a weak acid. Keep in mind that if you add a solid base, you will need to follow a different method to this.
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Alternative buffer calculation question where acid is added: • Acids and Bases: Buffe...
📚 The concepts covered here are applicable to all exam boards, such as AQA, OCR and Edexcel.
#alevelchemistry #acidsandbases #buffersolution #chemistryrevision #chemistryexam

[@easymodeexams33]

[HA] = 0.0389, not 0.00389!!! My mistake. [H+] and final pH is correct in the video, but I wrote the [HA] incorrectly.

[@IbrahimHassan-hf2ir]

Can you please do more of the Everything You need to know Topic style videos please. They are so helpful. Thank you for everything that you do for us. You are the best chemistry account out there.

[@easymodeexams33]

Fosho

[@angel-lh8sh]

OMG YOURE A LIFESAVER!! JUST IN TIME FOR ME TO GO OVER THIS TOPIC AFTER COVERING IT IN CLASS🤞🏾

[@daisylawrence7447]

if the question tells you what the buffer solution contains, does this mean you don't need to work out final moles because the buffer has already been formed and the reaction has happened?

[@easymodeexams33]

I've never seen a question in that format tbh, they will normally tell u starting variables, and you calculate final buffer variables

[@balajipalaniappan6804]

Awesome, thanks, is there a video doing pKa and those pH curve graph questions

[@easymodeexams33]

This should be the one: th-cam.com/video/jr8AhWGl050/w-d-xo.html
good luck :)

[@Charisse_]

With example 1. Did we have to work out the moles because the concentrations given initially is what they were *before* they were mixed so you can’t just use those concentrations and put them into the ka equation ?

[@easymodeexams33]

Exactly! :)

[@daisylawrence7447]

8:45 so for buffer calculations do you always minus OH- from the acid because in buffers the equilibrium always shifts right?
also thanks for such helpful videos!

[@daisylawrence7447]

does this calculation basically give you the unreacted CH3COOH value?

[@oliviaa6412]

Pls lmk if you ever find out the answer as I’m wondering the same thing

[@fryhyh]

Wouldn’t A- be the concentration of CH3COO-, not OH- ?

[@spitefulsaiyan4690]

Thank you!

[@RayLe-bd3xp]

Hi when are u going to release aqa biology paper 2 analyses please

[@easymodeexams33]

Should be in next couple weeks 🤞

[@evlaar280]

I'm confused by your value for [HA] I did 0.00175/45/1000 and got concentration as 0.0389 but I don't know how I've got a power of 10 error when I used the same numbers as you

[@easymodeexams33]

100% correct bro, should be 0.0389, my mistake. Everything else should be correct. I'll leave a pinned comment, cheers

[@gianne7391]

hi is there any point in still dividing it by the total volume? especially as they still cancel out?

[@easymodeexams33]

Yeah you can skip that step :)

[@gianne7391]

@@easymodeexams33 thanks for your help! your videos are really good, I got an A* in my recent test :)

[@courtneylust]

my goat. if you have 0 fans im dead

[@easymodeexams33]

lmao

[@meerabfatima2709]

Can you please do Alkanes

[@easymodeexams33]

Fosho, u in year 12?

[@meerabfatima2709]

@@easymodeexams33 yes i am.