OK, so I have this practical tomorrow but aren't 100% sure on a couple of things. I need to get a pretty high A, or else I'm fucked.
So anyway, the first one seems OK, you just do
5.200 (the mass I used) X1000 / 204.2 X 250... right? (I'm not sure of the units, though.
For 2, you need the molar concentration. Now, the formula we use to get concentration is moles/volume in dm cubed. BUT... I don't know what the moles are. Are the MOLES
what I had for the first question? If so, I could do:
*moles in first question*/ volume (which was an average of 23.35cm3)/1000
= mol dm-3
and for question 3 it would just be the same as question 2 but with my second volume from titration 2 (which was 25.35cm3)
I think thats right... but I'm not sure if the concentration
for the first question is the same as the moles
. I have no other way of working out the moles for the C= N/V thing.
I hope you're following me.
So basically I just want to know how to work out the second question. Someone else suggested it could be... moles of KHP= molar concentravion X the titation volume (23.35) / 1000. Thus, that is the moles of NaOH, so, concentration NaOH would = moles/volume of NaOH (25cm3)/1000.
It's so stupid but I need to get it right.