Such a good video thank you! Just one question, for the sharp/small drop for addition of HCl to the bases, why would ammonia be a sharp drop if it is a weaker base? I thought KOH would have the sharper fall because it starts with a higher pH (more alkaline) and then drops the pH? Not sure if I am making sense or if I have just misunderstood.
Jack Wardith Hi there, I did use the same method, just you need to double the conc of the acid to get the H+ conc as sulfuric is diprotic (donates 2 protons when it dissociates). Make sense?
Hi sir, could you explain further about "small" vs "sharp" drop/rise in pH for certain mixtures please? I don't understand why some would be a "sharp" drop/rise but some would be a "small" drop/rise? Thanks!
Raffaella Rose Thanks, glad they're helping. These videos are just my take on what I think could be on the exam re practical style questions. Until we see the real exams I won't know for sure. I have used the specimen papers to get some ideas so hopefully they'll be reasonably close.
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Such a good video thank you! Just one question, for the sharp/small drop for addition of HCl to the bases, why would ammonia be a sharp drop if it is a weaker base? I thought KOH would have the sharper fall because it starts with a higher pH (more alkaline) and then drops the pH? Not sure if I am making sense or if I have just misunderstood.
YOU ARE THE GOAT!
How would you work out PH if the buffer was acid/alkali instead of acid/salt. Would you subtract the mol of alkali from the acid.
Hi mate. Great video again...I don't fully understand the Sulphuric acid pH. Why do not use same method as HCl?
Jack Wardith Hi there, I did use the same method, just you need to double the conc of the acid to get the H+ conc as sulfuric is diprotic (donates 2 protons when it dissociates). Make sense?
MaChemGuy thanks for the response. How can you tell it's diprotic? Do you just write its equation out for when it dissociates?
Jack Wardith You can tell from the formula. HCl is monoprotic, H2SO4 is diprotic and H3PO4 is triprotic etc
Hi sir, could you explain further about "small" vs "sharp" drop/rise in pH for certain mixtures please? I don't understand why some would be a "sharp" drop/rise but some would be a "small" drop/rise? Thanks!
Bril videos, they are helping loads with chem revision! Are the pags all we need to know for the written exam practical wise?
Raffaella Rose Thanks, glad they're helping. These videos are just my take on what I think could be on the exam re practical style questions. Until we see the real exams I won't know for sure. I have used the specimen papers to get some ideas so hopefully they'll be reasonably close.
Why is 1% of ammonia used in the calculations for pH?
do we need to know all the PAGS 1-11?
You could be asked about any of them so yes