Turn on thread page Beta

Why does molar conductivity increase with decreasins concentration? watch

    • Thread Starter
    Offline

    2
    ReputationRep:
    Could you explain by talking about the molecules rather than the equation?
    Offline

    13
    ReputationRep:
    (Original post by outrun)
    Could you explain by talking about the molecules rather than the equation?
    First of all, it's not about molecules. You need ions to conduct electricity, not molecules.

    Conductivity changes with the concentration of the electrolyte. The number of ions per unit volume carrying the current decreases on dilution, so conductivity always decreases with decrease in concentration.

    However, molar conductivity increases with dilution. This is because conductivity of a solution is the conductance of one unit volume of the solution, but molar conductivity is the conductance of that volume solution containing one mole of electrolyte.

    As the total volume of solution containing one mole of electrolyte increases, the decrease in conductivity due to dilution is more than compensated by increase in its volume of solution that contains one mole of the electrolyte.
    Offline

    2
    ReputationRep:
    Nice explaination
 
 
 

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
Poll
How are you feeling in the run-up to Results Day 2018?

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

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