Help Making Ferric Solutions

Request or contribute your recipes here. You can also try doing a search, as there are some old recipe posts which have not or cannot be moved over to this forum.
Post Reply
User avatar
smiley
Posts: 1398
Joined: 20 Nov 2006, 10:00
State/Location: QLD

Help Making Ferric Solutions

Post by smiley »

I've been asked to make a 1M ferric solution, for use with galvanic cells. I tried Ferric chloride, and it is simply not possible to dissolve that much powder!

Any suggestions? Is it even possible to make a 1M Ferric solution? Help. :cry2:
Cheers, K 8-)
User avatar
lada
Posts: 1024
Joined: 29 Jun 2006, 10:00
State/Location: NSW

Re: Help Making Ferric Solutions

Post by lada »

I don't know, but why do teachers always "need" such high concentration.
I try to swap for 0.1-05M solutions which will give them same results.
Just make sure all solutions are same conc, if they take measurements.
Lada
User avatar
fibreweb
Posts: 620
Joined: 20 Jul 2006, 10:00
School: Oxley High School
Suburb: Tamworth
State/Location: NSW

Re: Help Making Ferric Solutions

Post by fibreweb »

I think they need that higher concentration because "that is what the book said"
how well do we know that what is in the book does not always work!
The people writing the book sometimes hasn't tried to actually do the prac.
In thoery it should work but not in practice.
User avatar
lada
Posts: 1024
Joined: 29 Jun 2006, 10:00
State/Location: NSW

Re: Help Making Ferric Solutions

Post by lada »

How true.
I was ask to make up 1L of AgNO3 for a displacement reaction.
Put coiled Cu wire in large test tube and cover with solution of silver nitrate. 27 students of 25ml solution about 700ml needed.
I gave them micro tubes small length of Cu wire and 3ml of solution each. Guess what, it worked very well and with only 80ml AgNO3 needed.
User avatar
smiley
Posts: 1398
Joined: 20 Nov 2006, 10:00
State/Location: QLD

Re: Help Making Ferric Solutions

Post by smiley »

We we are doing Galvanic cells. I have seen it work with other metals - Mg, Al etc. I think the problem here is that the teacher thought "Hey, I'll add in another metal!" but it seems to be physically not possible to make a 1M solution of that metal ion.
Cheers, K 8-)
User avatar
rae
Posts: 1045
Joined: 31 May 2006, 10:00
School: Oxley College
Suburb: Burradoo
State/Location: NSW

Re: Help Making Ferric Solutions

Post by rae »

We do this prac using 1M solutions. CuSO4, ZnSO4, Al(NO3)2 and FeSO4. Not ferric chloride.
User avatar
smiley
Posts: 1398
Joined: 20 Nov 2006, 10:00
State/Location: QLD

Re: Help Making Ferric Solutions

Post by smiley »

Thanks Rae, will give that a try!
Cheers, K 8-)
User avatar
rae
Posts: 1045
Joined: 31 May 2006, 10:00
School: Oxley College
Suburb: Burradoo
State/Location: NSW

Re: Help Making Ferric Solutions

Post by rae »

Smiley, we also recycle it. I have bottles labelled for "electrolysis only" and use it a few times.
MariaC
Posts: 174
Joined: 29 Oct 2008, 12:34
School: Central Coast Grammar School
Suburb: Erina Heights
State/Location: NSW

Re: Help Making Ferric Solutions

Post by MariaC »

Me too Rae, saves throwing and remaking!
User avatar
smiley
Posts: 1398
Joined: 20 Nov 2006, 10:00
State/Location: QLD

Re: Help Making Ferric Solutions

Post by smiley »

Oh..OK..I thought that it becomes denatured after use, coz it loses it's ions, so then it has to be chucked because it won't give an accurate reading for the next kid. That's what the chem teachers told me this morning!

We give ours target voltages and they have to work out the dilutions etc.
Cheers, K 8-)
User avatar
rae
Posts: 1045
Joined: 31 May 2006, 10:00
School: Oxley College
Suburb: Burradoo
State/Location: NSW

Re: Help Making Ferric Solutions

Post by rae »

You are probably right Smiley however my chem teacher doesn't mind and that's why I do it.
User avatar
smiley
Posts: 1398
Joined: 20 Nov 2006, 10:00
State/Location: QLD

Re: Help Making Ferric Solutions

Post by smiley »

Well, definitely cheaper & easier your way. :thumbup:
Post Reply