ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: naved_s9994 on July 13, 2009, 07:23:53 pm

Title: mass of solute..
Post by: naved_s9994 on July 13, 2009, 07:23:53 pm

whats the method?

mass of solute required to prepare solution:
100ml of anhydrous sodium carbonate, Na2 CO3 of concentration .05000 mol /L

Title: Re: mass of solute..
Post by: hyperblade01 on July 13, 2009, 07:39:02 pm

Use

n = cv

Then

m = nM

Title: Re: mass of solute..
Post by: naved_s9994 on July 13, 2009, 07:41:55 pm

okay, soory i havnt used m = nM before
n is moles..
what about the rest?

m mass???
M molar mass???

Title: Re: mass of solute..
Post by: hyperblade01 on July 13, 2009, 07:48:06 pm

Sorry, I can't remember when all those formulas were suppose to be learnt :P

n = moles
c = concentration in moles per litre
v = volume in litres

m = mass in grams
M = Molar mass which in this case is [2(23) + 12 + 3(16)]

Don't forget significant figures :)

Title: Re: mass of solute..
Post by: naved_s9994 on July 13, 2009, 07:53:45 pm

yea .
sure thing
thanks !