Help! AS Chem PAG

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

    1
    ReputationRep:
    We did an experiment to determine the ram of mg. we placed mg in h2so4 and measured the volume of hydrogen produced. When we placed the mg into the boiling tube containing the acid we had to remove the Bung which allowed an error in our results. Is there a way of removing this error. Is there any apparatus that would allow me to place the mg into the acid without letting in extra air.
    Online

    3
    ReputationRep:
    Put the Mg in the bottom of a 3-necked round bottomed flask, have a septum over one of the necks, a stopper in another and your gas syringe connected to the last.

    Squirt in the sulfuric acid through the septum from a syringe, accounting for whatever volume of gas this will push into the gas syringe.

    Allow everything to cool to room temperature after the reaction has subsided, then measure the volume.
    Offline

    2
    ReputationRep:
    (Original post by ishaniss)
    We did an experiment to determine the ram of mg. we placed mg in h2so4 and measured the volume of hydrogen produced. When we placed the mg into the boiling tube containing the acid we had to remove the Bung which allowed an error in our results. Is there a way of removing this error. Is there any apparatus that would allow me to place the mg into the acid without letting in extra air.
    The thing is your losing Hydrogen gas since the reaction is fastest at the start. There are apparatus that allow you to do that, so add the magnesium onto a string and attach to the bung then lower bung, so your sealing the flask and adding the magenisum at the same time. However you now adding a third reactant -the string. The best way is to use a divided flask you put it all in and shake it, but schools don't really have these since its just a PAG don't worry about losing any gas, it don't have to be accurate, just mention it in your write up.

 
 
 
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 18, 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.