You are Here: Home

# Concentration in the format xM? Watch

1. Hi there! This may sound like a stupid question but it's something I've never been taught. I need to know this for Physics.

When given a concentration in the format 0.5M (0.5 is just an example), what does it actually mean? It's 0.5, but out of what? A litre? A decimetre cubed? Is it in moles?

Thanks!
2. (Original post by JustJusty)
Hi there! This may sound like a stupid question but it's something I've never been taught. I need to know this for Physics.

When given a concentration in the format 0.5M (0.5 is just an example), what does it actually mean? It's 0.5, but out of what? A litre? A decimetre cubed? Is it in moles?

Thanks!
It's just a shorthand way of writing mol dm-3 , known as the molar ratio between the moles of solute per dm3
So 0.5M = 0.5 mol dm-3

I also remember wondering what it was and just being puzzled by it

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 15, 2016
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## 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.

• Poll
Discussions on TSR

• Latest
• ## 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.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.