Serial Dilution | Required Practical Revision for Biology and Chemistry A-Level

Producing a serial dilution for a glucose calibration curve or in microbiology for bacterial growth. This is part of the required practicals for A-Level biology and a key skill for A-Level chemistry. This was filmed at the Kingston University STEM Outreach Centre.
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[@adammohammed4711]

I would like to see the cat please

[@WildWolfFuryAMV]

I've already completed this practical and completed an assignment on it, on my Level 3 BTEC biomedical science, but this video was still a useful recap!

[@blazebangerz3122]

Thanks a lot! I actually understand this now :)

[@Primrose_Kitten]

Glad it helped!

[@blazebangerz3122]

lmao i've come back here to revise for another mock tommorow

[@sdwzzz3344]

@@blazebangerz3122its my turn now 😭

[@samirihamk8747]

Hi! Can you tell me, how does serial dilution help estimate bacterial growth? You decrease the concentration gradually of bacteria, then you take the 5th decreased concentration and spread it on your agar? Is it, because serial dilution helps produce a smaller bacteria concentration, which means we can count it more easily and therefore make a better estimate of bacterial growth?
Thankyou!!

[@tasneemayham974]

In the last tube, do we remove 20 cm3 also to keep the volume the same or it is okay if we keep it the same?

[@drsophietan4284]

Hi, I saw your comment on this video in 2024. You won't need to remove 20cm3 in the last test tube, because you aim to make a solution with the correct concentration. Regardless, if you remove 20cm3 in the last test tube, the concentration would be the same anyway. I hope I understand your question correctly.

[@tasneemayham974]

​@@drsophietan4284 Yeahh!! I figured that out! I did my Official Exams in 2022, and the examiner asked me that question! Your answer was exactly the same as mine!! Our aim is the solution not the volume. So it doesn't really matter!
Thank you!!

[@Mr_Rawan007]

I want to join Kingston university

[@aluminiumoxide8750]

Is proportional dilution same as stock dilution ?

[@user-ey2rl2vx3q]

hi how do i know how many times of transfering the solution into next volumetric flask should be done?

[@Saffron_Roberts]

THANK YOU!!

[@alex-do9fh]

Hi, I'm a bit confused on how you get from 0.1875M to 0.01M?

[@nmachiitumoh3975]

SAME THINKING HERE !!! I think she meant 0.09m.

[@alex-do9fh]

@@nmachiitumoh3975 I agree, I think that makes more sense!

[@karolinapefinde6737]

She rounded of

[@foreverJensenRossAckles]

Did you start with pure food dye or did you start with a dilution?

[@Hussein.H.Mohamed]

Dilution

[@Hussein.H.Mohamed]

Why did you like me comment

[@setumia8941]

Dang it that u can't do physics a level but will u make a level maths pls?

[@swagdisease7376]

Did you do well in it or did you die?

[@melissatiley3481]

Do you do Alevel Maths

[@Primrose_Kitten]

Hi Melissa, this is on my list of things to do and I promise it's coming soon!