# Mol/Dm3 or G/Dm3?

Watch
Announcements
#1
In my GCSE revision guide, it says that the concentration of something is the mass/volume... but when doing titrations, the formula to find the concentration can also be number of moles/volume.

Which formula should I use: Mass/Volume, or Moles/Volume?
Thank you 😃
Last edited by Alessandro.C_27; 2 years ago
0
2 years ago
#2
You can use both it depends what information you are given in the question
1
2 years ago
#3
Both are valid forms, usually concentration will be given in mole/volume.
If you need to change between moles and mass just use Mass = Mr * Mole
1
2 years ago
#4
(Original post by Alessandro.C_27)
In my GCSE revision guide, it says that the concentration of something is the mass/volume... but when doing titrations, the formula to find the concentration can also be number of moles/volume.

Which formula should I use: Mass/Volume, or Moles/Volume?
Thank you 😃
In the revision guide, it's explaining the general principle. If you were describing the 'concentration' of sugar in your tea, you'd talk about the 'amount' of sugar you'd put in the cup. And you'd ordinarily describe 'amount' in terms of mass - thus, mass/volume is a way of describing concentration.

Being more scientific about it, 'mass' doesn't properly describe 'amount of substance', because different atoms have a different mass, relative to one another. As you know, 'amount of substance' is properly masured in moles, and thus concentration is moles/volume. You'll see this written differently as mol.dm-3, mol/dm3, mol/L, mol.L-1, 'M'...
Last edited by Reality Check; 2 years ago
1
#5
Thank you for the info guys... I understand it now
(Original post by Becca216)
You can use both it depends what information you are given in the question
(Original post by ThatGuy107)
Both are valid forms, usually concentration will be given in mole/volume.
If you need to change between moles and mass just use Mass = Mr * Mole
(Original post by Reality Check)
In the revision guide, it's explaining the general principle. If you were describing the 'concentration' of sugar in your tea, you'd talk about the 'amount' of sugar you'd put in the cup. And you'd ordinarily describe 'amount' in terms of mass - thus, mass/volume is a way of describing concentration.

Being more scientific about it, 'mass' doesn't properly describe 'amount of substance', because different atoms have a different mass, relative to one another. As you know, 'amount of substance' is properly masured in moles, and thus concentration is moles/volume. You'll see this written differently as mol.dm-3, mol/dm3, mol/L, mol.L-1, 'M'...
1
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

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

### Poll

Join the discussion

Yes (15)
31.91%
No (32)
68.09%