chemistry plan OCR HELP please!! Watch

This discussion is closed.
halfaneye
Badges: 0
#1
Report Thread starter 16 years ago
#1
Has anybody done thier chemistry plan for OCR, im really stuck ;(
0
cobra
Badges: 14
Rep:
?
#2
Report 16 years ago
#2
Tell us more and i'll try to help
0
halfaneye
Badges: 0
#3
Report Thread starter 16 years ago
#3
strips of magnesium ribbon become corroded on their surface, if they are left lying around in the lab for several days. The corrosion layer is mainly a mixture of magnesium oxide and magnesium hydroxide, but a small amount of magnesium carbonate is sometimes present.

plan experiments
a) find out whether or not the corrosion contains magnesium carbonate
b)to determine the % purity by mass of magnesium in a corroded sample of magnesium ribbon using an acid of your choice
0
cobra
Badges: 14
Rep:
?
#4
Report 16 years ago
#4
Ahh yes, sumone else posted about this, the carbonated can be detected if it fizzes with HCl but unfortunatly Mg dissolves in HCl
0
halfaneye
Badges: 0
#5
Report Thread starter 16 years ago
#5
Im pretty sure i can find out if it contains carbonate, but not quite sure what it wants me to do with the acid. Any suggestions???
0
halfaneye
Badges: 0
#6
Report Thread starter 16 years ago
#6
I mean im not sure how to find the % mass with an acid, is it hinting at a titration or is it another method??
0
cobra
Badges: 14
Rep:
?
#7
Report 16 years ago
#7
have you covered redox titrations?
0
halfaneye
Badges: 0
#8
Report Thread starter 16 years ago
#8
umm.....no not in AS
0
cobra
Badges: 14
Rep:
?
#9
Report 16 years ago
#9
Then it could be more difficult cos if you did a titration with manganate 7 i rekon youcould find the mass and do a % mass calc and that would be it, yeah we didnt do redox until A2 so i'm baffled now
0
halfaneye
Badges: 0
#10
Report Thread starter 16 years ago
#10
i figured everythin out, but thanks everyone
0
cobra
Badges: 14
Rep:
?
#11
Report 16 years ago
#11
Good, what was the answer
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Sheffield Hallam University
    Get into Teaching in South Yorkshire Undergraduate
    Wed, 26 Feb '20
  • The University of Law
    Solicitor Series: Assessing Trainee Skills – LPC, GDL and MA Law - London Moorgate campus Postgraduate
    Wed, 26 Feb '20
  • University of East Anglia
    PGCE Open day Postgraduate
    Sat, 29 Feb '20

Do you get study leave?

Yes- I like it (244)
61.93%
Yes- I don't like it (18)
4.57%
No- I want it (106)
26.9%
No- I don't want it (26)
6.6%

Watched Threads

View All