Buffers Calculations - Various Examples (AQA A Level Chemistry)

This video discusses briefly some key ideas regarding buffers before talking through a series of different example calculations.

[shadowshot]

unless i'm doing something very wrong at 19:45 i think the mols of CH3COOH should be 9.25x10^-3 incase anyone doing calculations along with the video

[mez]

@20:42 shouldnt the moles at equilibrium of ethanoic acid be 9.25x10^-3?

[raheema]

Brilliant video, this really helped me understand buffer calculations, I'll be sharing it with my classmates

[dansland]

i have an acids, bases and buffers test tomorrow . its 2 am and u have saved my life honestly . : ))))

[mauve]

For the last example I keep getting 1.312x10-4 as H+, is there something wrong 😅

[treasuregeorge]

For the question at 23:41
you used the moles of the acid and the salt, why didn't you divide them by the total volume to get their concentrations

[madhaviochani]

Hello. Really helpful video. I just had one question as to why in the very last problem, when you added HCL, you took 'before' moles and not the 'after' ones to add to the moles of HCL

[st]

Hi sir. For the last one, when calculating the concentrations after adding an extra 5cm3 of hcl. Would you include that volume in the total volume when calculating the new conc. I know it cancels but if you did wanna work it out would you add the 5cm3 to the total vol or is it negligible? Thanks.

[sdog]

Smashing video, thank you for your hard work

[samantharichards]

Your videos are very helpful!:) Could I just ask; why with some do you write out the equation and work out the amount of product produced via the limiting reactant (eg 16:30) and others you don't? I understand how to use both methods, where you go straight into kaacidoversalt/rearranging kaacidoversalt and then when you instead use the equation to calculate moles produced but not when to use them?

[tahakarim]

29:16 Isn't the concentration of ch2clch2c00h = 0.019767.... as that is how much acid is remaining. I think you plugged the moles of the acid remaining into the ka eq but not its concentration?

[MS-emiv]

In the first question why did you use the concentrations of each substance in the final calculation but in the other questions you used moles in the final calculation. How are we meant to know when to use moles and when to use concentrations?

[dno.]

I understand the principle for why we added and subtracted mol of hcl due to equilibrium at 36:52 but how come you didn’t use the ICE table format from before?

[darkhacker]

Will you do predictions for the papers based on the advance info? And will you be doing any last minute tips/ revision for the paper 1-3?

[Parsimoniouspenguin]

Why not just use the Henderson-Hasselbalch equation?

[ltharold]

You are very good at explaining, keep up the good work !!