Bromine water
- Lis
- Posts: 362
- Joined: 01 Jun 2006, 10:00
- Job Title: Laboratory Technician
- School: Central Coast Grammar
- Suburb: Erina Heights
- State/Location: NSW
Bromine water
I have been asked in the past to make Bromine water by distilling potassium bromide, manganese dioxide and conc sulphuric acid into a drescher flask with distilled water, I was wondering if anyone makes it this way anymore, as it is quite dangerous.
Bromine Water
The above methods are great. When it comes to making up Br Water I usually use the small Br Ampoules. This contains a small volume of Elemental Br and allows to make enough solution for use without waste.
This way I seem to make it on a use as needed basis, without the need to worry about the solution going "Stale".
I have Risk Assessments in place for the use of Br Ampoules which greatly reduces uncertainty of handling, storage and use if other people make the solution up.
This way I seem to make it on a use as needed basis, without the need to worry about the solution going "Stale".
I have Risk Assessments in place for the use of Br Ampoules which greatly reduces uncertainty of handling, storage and use if other people make the solution up.
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
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Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Bromine water
Another method for Br water - 0.1M Bromine solution may be made as follows: Weigh 1.67g of potassium bromate and 6.19g potassium bromide. Add 10ml water followed by 15ml 2M H2SO4. Stir. Make up to 100ml with H2O, warm to 60degrees for a few mins in a fumehood. Seal in glass bottle. Store in refrigerator.
Wombat
Wombat
Bromine Water
The only problem with this method though is that the solution is acidic. When used in the Addition reactions of Alkenes the solution may starve the alkene of braches as protons are donated to the double bond therefore re-hydrogenating the process.
The process still works but not as efficient as one would predict.
The process still works but not as efficient as one would predict.
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Re: Bromine water
Hi All
I need Bromine Water for period 2 today. I have 1ml ampoules but don't know what volume they make up to.
Appreciate any help.
Thanks in advance
Rita
I need Bromine Water for period 2 today. I have 1ml ampoules but don't know what volume they make up to.
Appreciate any help.
Thanks in advance
Rita
- Labbie
- Posts: 3243
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Re: Bromine water
You should not be using the ampoules any more, they were banned years ago.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
- Jody1
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- School: Casula High School (currently)
- Suburb: Casula
- State/Location: NSW
Re: Bromine water
I've discovered we have Bromine water already made up in the Chemstore in bottles that look older than I do. One of the chemistry teachers kindly showed me where to find it and also told me that if anyone asks for it to be made up, it should only be done by a Chemistry teacher or qualified chemist.
Jody
Re: Bromine water
I still use the ampoules. There were 6 here when I started here and I'm using them until they're gone. CSIS has the pure bromine as teacher use only.
I prepare the bromine by using the instructions in CSIS volume 2 appendix B by opening the bromine ampoule (1 ml) under water (200 ml) in a fume cupboard. I used double gloves and break the ampoule with strong scissors or crucible tongs. Store in dark glass bottle away from light.
I prepare the bromine by using the instructions in CSIS volume 2 appendix B by opening the bromine ampoule (1 ml) under water (200 ml) in a fume cupboard. I used double gloves and break the ampoule with strong scissors or crucible tongs. Store in dark glass bottle away from light.
Last edited by AnnNos on 19 Oct 2015, 08:47, edited 1 time in total.
- rae
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- School: Oxley College
- Suburb: Burradoo
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Re: Bromine water
1ml to 200ml water. Make sure you do it in a fume cupboard and wear all your ppe.
- Lyn
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Re: Bromine water
I still have a number of 1ml ampoules in storage but will not make up the solution myself. If a chemistry teacher wishes to make up their own solution then that is fine by me. I have watched an experienced chemistry teacher have a mishap while making up a solution from an ampoule and he received burns on his hand and arm. Information from the scienceassist chemical list says Bromine is fatal if inhaled and causes severe skin burns and eye damage. I would be interested to know if Rita went ahead and made up the solution or passed it onto the chemistry teacher.
- rae
- Posts: 1045
- Joined: 31 May 2006, 10:00
- School: Oxley College
- Suburb: Burradoo
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Re: Bromine water
I have Bromine in a bottle not ampoules. I think it is easier to manage. Never liked ampoules.
Re: Bromine water
I thought we used ampoules because we can't keep any more than 10 ml of Bromine on site?
- Labbie
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Re: Bromine water
Then why do they sell in 1L bottles or 500ml bottles?
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
- rae
- Posts: 1045
- Joined: 31 May 2006, 10:00
- School: Oxley College
- Suburb: Burradoo
- State/Location: NSW
Re: Bromine water
I think I bought 100ml a couple of years ago.
Re: Bromine water
Is it bromine or bromine water? Pure bromine is restricted to 10 ml.
- Labbie
- Posts: 3243
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Bromine water
Sorry my mistakeI meant Bromine water.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired