hey! i couldnt find a thread for chem unit 6b so i decided to start this one! does anyone have good revision notes??? tbh i have just started with it and i am struggling.
hey! i couldnt find a thread for chem unit 6b so i decided to start this one! does anyone have good revision notes??? tbh i have just started with it and i am struggling.
i am Completely lost in this unit no idea what to do
Someone please explain why the potassium manganate questions are sometimes from purple to colorless and sometimes colorless to pink thank you
If u have potassium manganate in a burette and pour it into a flask containing a colorless solution, the end point would be when the the purple manganate that ur adding does not become decolorised. So it remains and makes the colourless solution pink.
But if u have the manganate in the flask and add in a colorless reducing agent(for instance fe2+) the end point is when the purple manganate is finally wholly decolorised (all manganate has turned to mn2+)
In short, u gotta be careful about what substance is where.
If u have potassium manganate in a burette and pour it into a flask containing a colorless solution, the end point would be when the the purple manganate that ur adding does not become decolorised. So it remains and makes the colourless solution pink.
But if u have the manganate in the flask and add in a colorless reducing agent(for instance fe2+) the end point is when the purple manganate is finally wholly decolorised (all manganate has turned to mn2+)
In short, u gotta be careful about what substance is where.
wtf is this june 2016 paper??!!! did anyone attempt it ???? i was solving all the papers and everything was going fine now i solved that paper and i feel so depressed and unready for the exam!!! ughhhhhh i neeed help with it