Hey there! Sign in to join this conversationNew here? Join for free to post

Biology Isotonic Level

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
    • Thread Starter

    the isotonic concentration of glucose should be twice that of NaCl why?!!!

    (Original post by rosegirl10)
    the isotonic concentration of glucose should be twice that of NaCl why?!!!
    Should really be in the Study Help section, but I'll bite.

    It's due to a difference in osmolarity (Osm/L), which takes into account the dissociation of a compound into its constituent ions. NaCl, dissociates into Na+ and Cl- when dissolving in water. Therefore, when 1M of NaCl dissolves in water, it has an osmolarity of 2M. Glucose cannot further dissociate in a solution. Thus, 1M of glucose has an osmolarity of 1M in water.
Write a reply…


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: April 15, 2016
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.

What do wear to bed?
Useful resources

Quick Link:

Unanswered Life Sciences Threads

Groups associated with this forum:

View associated groups

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.