Concentration Calc Help

Announcements Posted on
How helpful is our apprenticeship zone? Have your say with our short survey 02-12-2016
    • Thread Starter
    Offline

    0
    ReputationRep:
    Can anyone help, how do i find the undiluted concentration of H2SO4, 100cm3 was diluted with water to make a 1.00 dm3 solution.

    I know from my previous calc that the concentration of the diluted H2SO4 was 0.625 moldm3 (moles 0.0125 / vol 0.02 dm3)

    but am struggling with the last bit
    Offline

    3
    ReputationRep:
    (Original post by redfoo12)
    Can anyone help, how do i find the undiluted concentration of H2SO4, 100cm3 was diluted with water to make a 1.00 dm3 solution.

    I know from my previous calc that the concentration of the diluted H2SO4 was 0.625 moldm3 (moles 0.0125 / vol 0.02 dm3)

    but am struggling with the last bit
    Your initial dilution was from 100 to 1000ml

    This is a 10 fold (x10) dilution.

    This makes a concentration ten times more dilute.

    Hence the original solution was ten times more concentrated.
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by charco)
    Your initial dilution was from 100 to 1000ml

    This is a 10 fold (x10) dilution.

    This makes a concentration ten times more dilute.

    Hence the original solution was ten times more concentrated.
    so if concentration of 0.02dm3 diluted was 0.625 moldm3 then the 100 would be 10 x 0.625 = 6.25 moldm3 conc

    is that correct
    Offline

    3
    ReputationRep:
    (Original post by redfoo12)
    so if concentration of 0.02dm3 diluted was 0.625 moldm3 then the 100 would be 10 x 0.625 = 6.25 moldm3 conc

    is that correct
    If I understand you correctly...

    You dilute a stock solution by a factor of 10

    Then you test the concentration of a 20ml sample which turns out to be = 0.625 M

    If so, yes.
 
 
 
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 14, 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.

Today on TSR
Poll
Would you rather have...?
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.