conc mol vol

Announcements
    • Thread Starter
    Offline

    0
    ReputationRep:
    which of the following contains the most chloride ions?
    A) 10cm3 of 3.3x10-2 mol/dm3 aluminium chloride solution
    B) 20cm3 of 5x10-2 mold/dm3 calcium chloride solution
    C) 30cm3 of 3.3x10-2 mol/dm3 hydrochloric acid
    D) 40cm3 of 2.5x10-2 mol/dm3 sodium chloride solution

    i converted units so all were in dm and i got B and D as the same which was 1000 moles but the mark scheme stated B was the correct answer why is this if b and d are both the same
    Offline

    3
    ReputationRep:
    (Original post by hanakm)
    which of the following contains the most chloride ions?
    A) 10cm3 of 3.3x10-2 mol/dm3 aluminium chloride solution
    B) 20cm3 of 5x10-2 mold/dm3 calcium chloride solution
    C) 30cm3 of 3.3x10-2 mol/dm3 hydrochloric acid
    D) 40cm3 of 2.5x10-2 mol/dm3 sodium chloride solution

    i converted units so all were in dm and i got B and D as the same which was 1000 moles but the mark scheme stated B was the correct answer why is this if b and d are both the same
    In one mole of calcium chloride (CaCl2), there are two moles of Cl- ions
 
 
 
Write a reply… Reply
Submit reply

Register

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: October 8, 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.

Poll
What is your favourite day of the week
Study resources

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

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