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Help with a Chemistry question on titration curves?
Explain the similarities and differences between the two titration curves, a and b, shown in the image. For each curve, identify the type of titrant added.
Any help would be greatly appreciated, I'm absolutely stumped.
1 Answer
- BriaRLv 77 years ago
Both graphs show an endpoint at 40ml but graph b shows a second endpoint at 20ml exactly half the final endpoint.
My interpretation is heavily loaded with guesswork so please double check!!
Graph b - the acid being titrated has a bivalent anion (eg sulphuric acid) and it being titrated with a monovalent anion (eg NaOH) to give 2 endpoints like this
Endpoint 1
NaOH + H2SO4 ===> NaHSO4 + H2O
Endpoint 2
NaOH + NaHSO4 ===> Na2SO4 + H2O
In graph a the titrant is a bivalent cation (eg Ca(OH)2 so there is a single endpoint
Ca(OH)2 + H2SO4 ===> CaSO4 + 2H2O
However! I repeat that if anyone says that is a load of rubbish I wouldn't argue too hard!!