Turn on thread page Beta

OCR (Salters) Chemistry Investigation -- Colorimetry question watch

    • Thread Starter


    I am doing my Chemistry Individual Investigation at the moment. I am investigation the rate of reaction between Peroxydisulphate ions and Iodide ions-- using iodine clock method(sodium thiosulphate-as rate determining step) and then colorimetry.

    But, in the lab we have digital and analog colorimeters and i cannot decide which to use!

    Digital - can be temperamental, but gives data to more decimal places and is more exact.

    Analog - works easily, but is down to my human judgement and error and i cant record values to 3dp! also the dial is constantly moving so each 5 seconds i have to try and read the value in a second! and its mind numbing! especially when my reactions can go on for 30mins!

    Does anyone have any suggestions on which to use? my teachers dont want to guide me!!!

Submit reply
Turn on thread page Beta
Updated: January 18, 2010
The home of Results and Clearing


people online now


students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Do you want your parents to be with you when you collect your A-level results?

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