Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hi, I'll be doing WJEC BY3 practical resits next week. There are a couple of things that I don't quite get. I'm doing enzyme based prac by the way.

    For example, for the independent variable. We have to do a range of 5 or more concentrations of hydrogen peroxide for example. The stock solution says 20 vol of hydrogen peroxide so that equivalents to 100%. So the possible ranges of concentration are: 0% 20% 40% 60% 80% 100%

    0% - 10 cm3 of water
    20% - 2 cm3 of hydrogen peroxide + 8cm3 of water
    And so on....

    But what if the stock solution says 2% hydrogen peroxide. How do we do the range of concentration?

    Thanks in advance...
 
 
 
Poll
Which pet is the best?

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.