Cobalt chloride
- Krysia Lee
- Posts: 228
- Joined: 27 Oct 2009, 10:40
- Job Title: Labbie
- School: Brigidine College
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- State/Location: NSW
Cobalt chloride
Hi Everyone
Does anyone out there know a good experiment for turning cobalt chloride from red to blue.
Thanks Krysia
Does anyone out there know a good experiment for turning cobalt chloride from red to blue.
Thanks Krysia
-
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Re: Cobalt chloride
it is blue when it is dry, so I don't know of an experiment to do this... I use a hair drier to dry out the paper strips and dissicator beads when they are pink.
Re: Cobalt chloride
One of our teachers used this the other day - to show transpiration in leaves. Soak filter paper in cobalt chloride solution and dry in air oven . Put in a plastic bag and seal around leaves of plant. Paper turns from pink to blue. TADA!!!
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- Posts: 1795
- Joined: 20 Mar 2007, 10:00
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Re: Cobalt chloride
Did I get it wrong? it is pink when dry? Oh well, then in that case anything that makes it absorb moisture from the surrounding environment will make it blue
Re: Cobalt chloride
cobalt equilibria-year 12 chemistry
cobalt solution - 1g of CoCl2.6h2O in 10 mL of 2 - propanol. Then add water dropwise until the deep blue solution just turns pink
1 ice bath
1 water bath at 100 degrees C
http://www.youtube.com/watch?v=BGfYf8OQzuk
cobalt solution - 1g of CoCl2.6h2O in 10 mL of 2 - propanol. Then add water dropwise until the deep blue solution just turns pink
1 ice bath
1 water bath at 100 degrees C
http://www.youtube.com/watch?v=BGfYf8OQzuk
Last edited by Jazz on 24 Feb 2011, 10:21, edited 1 time in total.
Cheers Jazz
Re: Cobalt chloride
Yes, we use cobalt chloride to test for water. In reaction to produce H2, we test by a "pop" test and then place a piece of CoCL2 paper in the mouth of t/tube to show a reaction of H2 with O2(from air) to produce water.
Chemistry teacher does equilibrium reaction with CoCL2 solution. I can look it up, if you want.
Lada
Chemistry teacher does equilibrium reaction with CoCL2 solution. I can look it up, if you want.
Lada
- Lyn
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Re: Cobalt chloride
Cobalt chloride paper is blue when dry and pink when moist. I keep my strips of paper blue by putting them in an airtight(?) jar with a layer of blue silica gel beads on the bottom to absorb any moisture. I replace the silica gel when the beads become pink.
Lyn.
Lyn.
Re: Cobalt chloride
Using dry blue cobalt chloride paper
just touch it with sweaty fingers, put it on forehead especially after exercise.
"what's in a breath?" Breath on it!
"What happens when fuels burn?" Hold a clean test tube containing cold water just above the top of the flame (bunsen or other different fuels for comparison)) . If you see any "misting up" or droplets of clear liquid touch it with the bllue paper as a test for water. Soot (carbon) may be deposited too.
Rosalie (another one)
just touch it with sweaty fingers, put it on forehead especially after exercise.
"what's in a breath?" Breath on it!
"What happens when fuels burn?" Hold a clean test tube containing cold water just above the top of the flame (bunsen or other different fuels for comparison)) . If you see any "misting up" or droplets of clear liquid touch it with the bllue paper as a test for water. Soot (carbon) may be deposited too.
Rosalie (another one)
Re: Cobalt chloride
Hi All,
Cobalt Chloride soaked filter paper is a better option as this will allow you to use it in a range of applications.
Cheers,
Robb.....
Cobalt Chloride soaked filter paper is a better option as this will allow you to use it in a range of applications.
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 **
- Krysia Lee
- Posts: 228
- Joined: 27 Oct 2009, 10:40
- Job Title: Labbie
- School: Brigidine College
- Suburb: St Ives
- State/Location: NSW
Re: Cobalt chloride
Hi thanks for all the answers.
Jazz thats exactly what I was after its for a year 12 equilbrium prac. I got it to work using concentraed (10M) HCl but am reluctant to let the girls use that. Teacher said she'll dem it but I'll give your suggestion ago. Its sounds great.
Thanks again.
THE WEEKEND IS GETTING CLOSERRRRRRRRRRRRRR. Hang it there everyone.
krysia
Jazz thats exactly what I was after its for a year 12 equilbrium prac. I got it to work using concentraed (10M) HCl but am reluctant to let the girls use that. Teacher said she'll dem it but I'll give your suggestion ago. Its sounds great.
Thanks again.
THE WEEKEND IS GETTING CLOSERRRRRRRRRRRRRR. Hang it there everyone.
krysia
Re: Cobalt chloride
sorry from blue to pink - blame alziemers...
- Lyn
- Posts: 706
- Joined: 16 May 2006, 10:00
- Job Title: Lab Assistant (Technician)
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- Suburb: Darwin
- State/Location: NT
Re: Cobalt chloride
That Al Zeimers has got a lot to answer for. He's starting to hang around far too often lately.
- Krysia Lee
- Posts: 228
- Joined: 27 Oct 2009, 10:40
- Job Title: Labbie
- School: Brigidine College
- Suburb: St Ives
- State/Location: NSW
Re: Cobalt chloride
Jazz
everyone here has now done your cobalt equilbria prac and its an absolute winner. Such pretty colours too. Thanks alot for your help.
Krysia
everyone here has now done your cobalt equilbria prac and its an absolute winner. Such pretty colours too. Thanks alot for your help.
Krysia