[-sophie-]

Does anyone know the rules for what goes into the burette during the back titration, acid + unknown or the known base??????

[Aired]

(Original post by -sophie-)
Does anyone know the rules for what goes into the burette during the back titration, acid + unknown or the known base??????

You usually put the known substance into the burette.

[-sophie-]

cheers was thinking that but had a funny 5 minutes!!! using my brain too hard trying to do this damn titration its driving me nuts!

[SazzyC]

Apparently 'counting' the total numer of words is 1 mark out of 16!

[-sophie-]

yes nice one, but what if it isnt exactly right because I'm fudging mine a bit to give me less words!

[-sophie-]

hope nobody checks it, i did it on my biology plan and thats already handed in!!!

[TechnicalSchool]

About halfway done and you can see the time. I've drank more tea than someone who likes tea a lot. In future each thread should start with the actual question we've been set coz that stuff about the CaCO3/MgCO3 threw everyone off

[-sophie-]

yeah im in agreement with technicalschool

[Caggy Hole]

yay just finished my plan...woo hoo!! so relieved (but dont think my acid bit is very good...ah well). thanks evryone, its been so helpful to read all your comments. good luck for tomorrow!!!
xx

[TechnicalSchool]

Thanks!
Does anyone know the balanced equation for the MgCO3 + HCl, last minute or what?

[SazzyC]

MgCO3(s) + 2 HCl(aq) -----> MgCl2(aq) + H2O(l) + CO2(g)

[shamraiz]

well just want to say good look everyone, hope the practical is just as easy as the plan and hope they dont give us a hard calculation to do!

[shamraiz]

well here goes

[mich2005]

WOW that exam was mega easy!! apart from knocking the crucible over oops wel didnt effect the mass anyways!!! haha!!!!!!!!!! Theres me stressing so much and it was a piece of p*** So how bout every1 else? lol!!!

[brianfall]

see some other threads here;

http://www.thestudentroom.co.uk/t110702.html

and there's another one here;

http://www.thestudentroom.co.uk/t111971.html