Bromine
- Timtam
- Posts: 34
- Joined: 31 May 2006, 10:00
- Job Title: Lab Technician
- School: St Pauls International College
- Suburb: Moss Vale
- State/Location: NSW
Bromine
Hi All. I am having trouble storeing Bromine. could anyone help me? I know its to be stored in a fridge but I did that in my fridge and it discoloured the fridge. Can it be stored in a corrosive cabnet and in chemical store it is quite cold in my store. Thenk you for any help [/img]
- Ocean Breeze
- Posts: 798
- Joined: 01 Jun 2006, 10:00
- Job Title: Lab Manager
- State/Location: NSW
Hi Timtam.
I used to store it in fridge.. then one day the fridge destructed. We had to buy a new one.
I only buy in 1 ml sealed vials.
Once its made up, store in glass container with a glass lid.... and put some parafilm in between the seal as an extra precaution. Then store the bottle next to the exhaust vent. As soon as the topic is finished .. get rid of it ( eg, lid off, fume cabinet until all colour is gone)until you open a fresh vial next time.
R-S
I used to store it in fridge.. then one day the fridge destructed. We had to buy a new one.
I only buy in 1 ml sealed vials.
Once its made up, store in glass container with a glass lid.... and put some parafilm in between the seal as an extra precaution. Then store the bottle next to the exhaust vent. As soon as the topic is finished .. get rid of it ( eg, lid off, fume cabinet until all colour is gone)until you open a fresh vial next time.
R-S
I no longer buy Bromine until a week or so before it is to be used - unless I can beg/borrow some from a nearby school. We had a Bromine spill here last year when one of our teachers broke open a vial and burned his arm. After the FireBrigade and Hazmat people left (nearly 2 hours later) I told the Science Staff I would never order Bromine again, especially in vials. The Bromine water should be stored in a dark bottle, inside a box, in a very cool place if possible. However, apparently its shelf life is only about 12 months maximum, so the suppliers told me last year.
- ELIZABETH
- Posts: 233
- Joined: 02 Jun 2006, 10:00
- School: O'Connor Catholic College
- Suburb: Armidale
- State/Location: NSW
Ditto, Coxy. I just order a new bottle of Br water each year (if I remember!). I reckon the whole vial-under-the-water is just too dicey in a school situation. If teacers don't like it..........tuff.
There is a recipe for a Bromine water substitute to use in the alkane/alkene prac; I'll see if I can dig it out.
Regards all,
Elizabeth.
There is a recipe for a Bromine water substitute to use in the alkane/alkene prac; I'll see if I can dig it out.
Regards all,
Elizabeth.
Hi All
I no longer use the vials of Bromine to make Bromine water. This is the alternative recipe that I use and it works well.
Make Chlorine water by adding 40ml of sodium hypochlorite to 40 ml of 2M sulfuric acid. Beware of the effervescence and make up to 250ml with water.
Then use the Chlorine water and add 1 teaspoon of sodium or potassium bromide solid to the solution and Hey Presto. Much safer and it has a long shelf life too.
I no longer use the vials of Bromine to make Bromine water. This is the alternative recipe that I use and it works well.
Make Chlorine water by adding 40ml of sodium hypochlorite to 40 ml of 2M sulfuric acid. Beware of the effervescence and make up to 250ml with water.
Then use the Chlorine water and add 1 teaspoon of sodium or potassium bromide solid to the solution and Hey Presto. Much safer and it has a long shelf life too.
Bromine
Although there are some mixed emotions as to whether Elemental Bromine is better than Bromine Water, but personally I prefer Elemental Bromine. This way I can control the amount of Bromine I can dissolve in water. I do this by opening a fresh vial of Bromine and aspirating it through a syringe.
I then slowly add Bromine through the syringe to get the most out of absorption by the water, (Time being the essence in this case). Bromine is soluble in water to only 4.17g per 100g. This way I can get close to 4g of Bromine in water. Diagnostic tests including Organic Sequencing can be more accurately performed if high Br[sub]2[/sub] concentrations are needed.
As far as safety is concerned, if you treat the hazardous chemical with the respect it deserves and there are adequate Safety Equipment including PPE, Engineering Controls and Risk Assessments available, then there should be no problem with handling and or use of the product. Considering it is conducted by well trained staff in it’s use.
Robb.....
I then slowly add Bromine through the syringe to get the most out of absorption by the water, (Time being the essence in this case). Bromine is soluble in water to only 4.17g per 100g. This way I can get close to 4g of Bromine in water. Diagnostic tests including Organic Sequencing can be more accurately performed if high Br[sub]2[/sub] concentrations are needed.
As far as safety is concerned, if you treat the hazardous chemical with the respect it deserves and there are adequate Safety Equipment including PPE, Engineering Controls and Risk Assessments available, then there should be no problem with handling and or use of the product. Considering it is conducted by well trained staff in it’s use.
Robb.....
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 **
- Ocean Breeze
- Posts: 798
- Joined: 01 Jun 2006, 10:00
- Job Title: Lab Manager
- State/Location: NSW
I find that using the bromine vials make handling the substance easier .
When I need Br water... I just add iced water to a large beaker. Make sure its all done in the fume cbd.. switched on.
Grasp the tip of the glass vial between the jaws of 'pointy' pliers, hold under the water, and crush vial. Cover the beaker with parafilm until all the bromine has mixed through. Pour the bromine water into a prelabelled glass bottle, leaving the 'dregs' which contain the glass in the bottom of the large beaker. I leave the beaker until all the bromine has sublimed, then use a paper towel and gloves to collect the glass fragments, and pop them into the 'glass' bucket.
I keep a pair of pliers especially for the bromine job.
The whole process is done in the fume cbd.
R-S
When I need Br water... I just add iced water to a large beaker. Make sure its all done in the fume cbd.. switched on.
Grasp the tip of the glass vial between the jaws of 'pointy' pliers, hold under the water, and crush vial. Cover the beaker with parafilm until all the bromine has mixed through. Pour the bromine water into a prelabelled glass bottle, leaving the 'dregs' which contain the glass in the bottom of the large beaker. I leave the beaker until all the bromine has sublimed, then use a paper towel and gloves to collect the glass fragments, and pop them into the 'glass' bucket.
I keep a pair of pliers especially for the bromine job.
The whole process is done in the fume cbd.
R-S
more on Bromine
G'day all,
my chemistry teacher would like me to make up bromine water by dissolving a 1mL vial of elemental bromine into some hexane. This will totally dissolve the bromine and can be added to water as needed.
Has anyone else tried this method?
Also in the 1mL vial of elemental bromine, what is the layer between the bromine gas and the darker bromine?
~Robyn
my chemistry teacher would like me to make up bromine water by dissolving a 1mL vial of elemental bromine into some hexane. This will totally dissolve the bromine and can be added to water as needed.
Has anyone else tried this method?
Also in the 1mL vial of elemental bromine, what is the layer between the bromine gas and the darker bromine?
~Robyn
Bromine
Hi All,
What an interesting subject, gathering all of the ideas one can come to a conclusion that, it comes down to self preference as to who would use Br[sub]2[/sub] or Br[sub]2[/sub] Water. At the end of the day it will be whatever you are comfortable working with.
Cheers,
Robb...
What an interesting subject, gathering all of the ideas one can come to a conclusion that, it comes down to self preference as to who would use Br[sub]2[/sub] or Br[sub]2[/sub] Water. At the end of the day it will be whatever you are comfortable working with.
Cheers,
Robb...
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 **
bromine again
Hi
Just on the problem of storing our bromine, my concern is trying to reseal the bottle now that the original cap has disintergrated. What do you suggest is the best way to prevent the fumes escaping.
Thanks
Tania
Just on the problem of storing our bromine, my concern is trying to reseal the bottle now that the original cap has disintergrated. What do you suggest is the best way to prevent the fumes escaping.
Thanks
Tania
Bromine again
Dear Tania,
I'm assuming your bromine water is a solution of elemental bromine in water; that you have finished needing it for this year; and you don't have a replacement cap for that bottle so you can store it in the fridge until wanted again. (Actually, I would store it in a sealed bottle within another sealed bottle). Bromine is always rough on rubber, bottle caps, etc.
It's best to dispose of it, I reckon -
Wear latex (rubber) gloves, safety glasses and lab coat.
Work with the fume cupboard on high and allow most of the fumes to disperse into the atmosphere (don't worry, it's only a little amount). With the remaining solution, the Chemical safety in Schools Appendix E (disposal of waste chemicals) recommends adding a mild reducing agent such as sodium thiosulfate, sodium metabisulfite or a ferrous (iron11) salt.
Then wash down the fume cupboard sink with plenty of water.
Hope this helps,
~Robyn
I'm assuming your bromine water is a solution of elemental bromine in water; that you have finished needing it for this year; and you don't have a replacement cap for that bottle so you can store it in the fridge until wanted again. (Actually, I would store it in a sealed bottle within another sealed bottle). Bromine is always rough on rubber, bottle caps, etc.
It's best to dispose of it, I reckon -
Wear latex (rubber) gloves, safety glasses and lab coat.
Work with the fume cupboard on high and allow most of the fumes to disperse into the atmosphere (don't worry, it's only a little amount). With the remaining solution, the Chemical safety in Schools Appendix E (disposal of waste chemicals) recommends adding a mild reducing agent such as sodium thiosulfate, sodium metabisulfite or a ferrous (iron11) salt.
Then wash down the fume cupboard sink with plenty of water.
Hope this helps,
~Robyn