Iron II Sulfate
- Labbie
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Iron II Sulfate
On making this up, it is of course a light green. By adding Conc sulfuric acid it should go clear. But my 2 litres of freshly made up Iron II Sulfate, is not going clear. Is the chemical too old?
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
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Re: Iron II Sulfate
there is no need to use conc sulfuric acid, 2M will do. It is not suppose to go clear just lighter.
Cheers Jazz
- Labbie
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Re: Iron II Sulfate
Thank you Jazz
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
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- School: Merrylands High School
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Iron (11) Sulfate Gone Grown
My Iron (11) Sulfate - FeSO4 has gone BROWN...Can I add something to it to clear it up or Should I dispose and make up a New Batch????
Amanda ![Coffee :coffee:](./images/smilies/coffee1.gif)
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Re: Iron (11) Sulfate Gone Grown
I make it up fresh and make up just enough to cover the prac activity. I usually weigh out lots of 7g and keep it in glass vials, so all I need to do is make them up to 250ml for a 0.1m solution.
- Labbie
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Re: Iron (11) Sulfate Gone Grown
Iron II Sulfate, should be made up fresh every time, for it to work. Put a Fe nail (NEW) of course into the solution, this helps it not going to Iron III a little slower. After a week it goes down the sink, with plenty of water.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
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- DavidPeterson
- Posts: 196
- Joined: 02 Apr 2012, 12:19
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Re: Iron II Sulfate
I always use ferrous ammonium sulphate - this doesn't oxidise in solution to the brown ferric species. Stores longer and doesn't need to be made up immediately before use.
DCP ![Cool 8-)](./images/smilies/cool.gif)
STEM Resource @ Laboratory Manager
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STEM Resource @ Laboratory Manager
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- nickykinz
- Posts: 271
- Joined: 02 Feb 2009, 12:53
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- School: St Augustine's College
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Re: Iron II Sulfate
I bought ammonium ferrous sulfate to use in our cation identification prac and have just made a 0.1M solution. After making it I realised that I hadn't checked how to make it and that maybe it needed sulfuric acid in it like ferrous sulfate does. According to "The Laboratory" it doesn't though. Does anyone else use this chemical, do you use sulfuric when making it up and does it work ok in all of the different tests for Fe2+?
I see that David Peterson posted that he does (I think it was his post that got me to buy it in the first place) but I'm not sure if he is still on here.
Thanks in advance.
I see that David Peterson posted that he does (I think it was his post that got me to buy it in the first place) but I'm not sure if he is still on here.
Thanks in advance.
Nicky
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St Augustine's College
Augustine Heights, QLD 4300
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St Augustine's College
Augustine Heights, QLD 4300
- Labbie
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Re: Iron II Sulfate
CSIS page 135 tells us, " Slightly toxic if ingested. acidified solutions are stabel to oxidation. Iron (II) Compounds are susceptible to oxidation in air. Dilute solutions (0.1M) are used to test cations."
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired![Love :wub:](./images/smilies/wub.gif)
Lab Manager/Lab Tech, mind reading etc etc
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Re: Iron II Sulfate
An old post but I normally make this up with tap water as recommended in the Labbies manual for most solutions except Silver Nitrate .
Although the solid is a light green colour , the solution always quickly turns brown during stirring .
Well this time I used distilled water ( it's a new thing , I am using it for all solutions now ) .....and surprise , it stayed a light green colour . I'm curious to see how long it stays that way .
I showed my Chem teacher , he was as surprised as me , he's been served brown Iron II Sulfate Solution for over 30 years
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Always learning and discovering .
- Labbie
- Posts: 3243
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Re: Iron II Sulfate
Iron II Sulfate, should be made up fresh every time, for it to work. Put a Fe nail (NEW) of course into the solution, this helps it not going to Iron III a little slower. The little nail really does work.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired![Love :wub:](./images/smilies/wub.gif)
Lab Manager/Lab Tech, mind reading etc etc
Now retired
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- Labbie
- Posts: 3243
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
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Re: Iron II Sulfate
Last a few more days, then without one.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired![Love :wub:](./images/smilies/wub.gif)
Lab Manager/Lab Tech, mind reading etc etc
Now retired
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- Labbie
- Posts: 3243
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Iron II Sulfate
I have tried & Tried to undo this, but it will not let me. The Minute I did it, I realised. So Sorry
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired![Love :wub:](./images/smilies/wub.gif)
Lab Manager/Lab Tech, mind reading etc etc
Now retired
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