Results are out! Find what you need...fast. Get quick advice or join the chat
Hey there Sign in to join this conversationNew here? Join for free

How to calculate Percentage uncertainty??

Announcements Posted on
    • Thread Starter
    • 16 followers
    Offline

    ReputationRep:
    Here are the questions:

    Calculate the percentage uncertainty associated with the volume of sodium carbonate which you have transferred using a pipette (uncertainty associated with reading a 25cm3 class B pipette is 0.06 cm3)

    Calculate the percentage uncertainty associated with your average titre (uncertainty associated with each reading of a 50cm3 class B burette is 0.05cm3) My average titre reading was 23.7
    • 43 followers
    Online

    ReputationRep:
    Percentage Uncertainty = (Absolute Uncertainty / Measured Value) x 100

    Therefore:

    % for pipette = (0.06 / 25) x 100 = 0.24%


    % for burette = (0.05 / 23.7) x 100 = 0.21%
    • 2 followers
    Offline

    ReputationRep:
    yarghan
    • 0 followers
    Offline

    ReputationRep:
    (Original post by Nirgilis)
    Percentage Uncertainty = (Absolute Uncertainty / Measured Value) x 100

    Therefore:

    % for pipette = (0.06 / 25) x 100 = 0.24%


    % for burette = (0.05 / 23.7) x 100 = 0.21%
    Do you not multiply the second one by two (assuming the calculation for average titre was made from two values)? Sorry for re-awakening a 2 year old thread.
    • 21 followers
    Offline

    ReputationRep:
    (Original post by ERdoctor)
    Do you not multiply the second one by two (assuming the calculation for average titre was made from two values)? Sorry for re-awakening a 2 year old thread.
    yes, you do.

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. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: July 3, 2012
New on TSR

So how did you do?

Come into the GCSE forum to share your grades

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