Dilution help, hopefully simple problem.. Watch

mituozo
Badges: 14
Rep:
?
#1
Report Thread starter 10 years ago
#1
I'm using Oxalic Acid in an experiment, however I need to dilute it to be 0.1 mol per dm^-3.

I've been given the acid in a solid crystal dihydrate form.

I'm just wondering how I'd go about knowing how much to use to then be diluted by water.

Say I'm going to make up 1dm^3 of 0.1 mol dm^-3 Oxalic Acid solution..

The molar mass of Oxalic Acid is 90, and of the dihydrate i've been given - 126.

Is my working out below right for the amount of dihydrate I need to add to the water in order to make the solution?

Moles = Volume x Concentration
m = 1 x 0.1 = 0.1 moles.
Moles = Mass / Molar Mass
0.1 = x / 126

126 x 0.1 = mass of Oxalic Acid Dihydrate needed.
= 12.6g

Does that seem right to you?

Thanks for your help..
0
quote
reply
EierVonSatan
Badges: 19
#2
Report 10 years ago
#2
looks good :yy:
quote
reply
mituozo
Badges: 14
Rep:
?
#3
Report Thread starter 10 years ago
#3
Okay, cheers.. I just wanted to check as I wasn't sure if the 2H2O affected things other than the molar mass in the formula..
0
quote
reply
EierVonSatan
Badges: 19
#4
Report 10 years ago
#4
(Original post by mituozo)
Okay, cheers.. I just wanted to check as I wasn't sure if the 2H2O affected things other than the molar mass in the formula..
No when dissolved the acid will become 'separate' from the hydrating water molecules but you will still end up with 0.1 mole of the required acid
quote
reply
X

Reply to thread

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Lincoln
    Brayford Campus Undergraduate
    Wed, 12 Dec '18
  • Bournemouth University
    Midwifery Open Day at Portsmouth Campus Undergraduate
    Wed, 12 Dec '18
  • Buckinghamshire New University
    All undergraduate Undergraduate
    Wed, 12 Dec '18

Do you like exams?

Yes (173)
18.66%
No (561)
60.52%
Not really bothered about them (193)
20.82%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise