| Pages:
1
..
38
39
40
41
42
..
77 |
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
How'd you make it? Or do you own phosphoric acid...?
|
|
|
Texium
Administrator
Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Are you sure that's copper phosphate? I've never seen it make crystals
like that... or at all really. I've made it a couple times and it's always precipitated as a fine, blue powder.
|
|
|
Zephyr
Hazard to Others
Posts: 341
Registered: 30-8-2013
Location: Seattle, WA
Member Is Offline
|
|
I made it by reacting copper carbonate with phosphoric acid and drying it slowly in a desiccator over sodium hydroxide.
|
|
|
Texium
Administrator
Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Perhaps it is a soluble acid salt then, like CuHPO4
Analyzing the ratio of phosphate ions to copper ions in it would clarify it.
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
Nonetheless, very pretty. And if you can stoichiometrically analyze it (titration with NaOH?) then you've got a fine compound to vial. As long as it's
all the same salt, of course...
|
|
|
arkoma
Redneck Overlord
Posts: 1761
Registered: 3-2-2014
Location: On a Big Blue Marble hurtling through space
Member Is Offline
Mood: украї́нська
|
|
first reflux in my new space. pecan shells in acetone.
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
Cool 'hotplate' ! Wish mine had two plates, though I've seen ones with more too.
By the way, pretty pictures (1) ended at 40 pages. This thread has 40 now. Is it time for another, or did new software fix the problems with having a
40pg. thread?
|
|
|
plastics
Hazard to Others
Posts: 141
Registered: 6-11-2009
Member Is Offline
Mood: No Mood
|
|
Just trying out my 'new' reconditioned Edwards 2 stage vacuum pump
[Edited on 24-11-2015 by plastics]
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
Wow, very nice. Is that just the readout, or the entire device?
Did you purchase it new, or did you 'acquire' it used?
|
|
|
CrystalCage
Harmless
Posts: 7
Registered: 22-11-2015
Member Is Offline
Mood: No Mood
|
|
The first pic is the flat alum crystal
The second one is a perfectly octahedral alum crystal 
And the third one is sodium bicarbonate (baking soda crystal)
The crystals are homemade.  )
  
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
Nice. What's the second crystal inside of?
|
|
|
CrystalCage
Harmless
Posts: 7
Registered: 22-11-2015
Member Is Offline
Mood: No Mood
|
|
It is potassium alum crystal.
|
|
|
LargeV
Harmless
Posts: 12
Registered: 28-11-2015
Location: Connecticut
Member Is Offline
Mood: No Mood
|
|
He asked what you were storing the crystal in the second picture in
|
|
|
CrystalCage
Harmless
Posts: 7
Registered: 22-11-2015
Member Is Offline
Mood: No Mood
|
|
Oh, my apologies. The red one holding the crystal is the plastic base from graduated cylinder (my graduated cylinder broke :'( ) contained in a glass
jar.
https://static.fishersci.com/images/FS106312~wl.jpg
[Edited on 6-12-2015 by CrystalCage]
|
|
|
stibium
Harmless
Posts: 7
Registered: 9-12-2015
Member Is Offline
Mood: No Mood
|
|
Phosphorescent alkaline earth sulfides activated with bismuth.
From left to right:
BaS / SrS / CaS
|
|
|
Dmishin
Harmless
Posts: 32
Registered: 5-10-2015
Member Is Offline
Mood: No Mood
|
|
Nice one! But I should warn you that putting do-not-eat bags with crystal defeats the purpose of putting it into sealed container.
For sulfates, most common problem is not absorption of moisture from air, but dehydration.
Alum is very stable, but in extremely dry environment it could start loosing water and turn into white powder. For storing crystals, I would recommend
do the opposite: put into the sealed jar a piece of tissue, wet with saturated solution of the compound. It would create just right humidity level.
Used this method to preserve uncoated crystal of ferric alum - works great, crystal has not changed for months.
I have very strong suspicion that it sesquicarbonate (trona), not bicarbonate. Did you grew it from hot solution? Interesting result, by the way.
[Edited on 10-12-2015 by Dmishin]
|
|
|
CrystalCage
Harmless
Posts: 7
Registered: 22-11-2015
Member Is Offline
Mood: No Mood
|
|
The alum crystal is kept for 2 years in that conditions. But anyway, I will do your method in preserving my copper acetate crystal, which is still
growing.
I grew that star-shaped crystal in a hot solution... But that crystal is very fragile. It crushed when I picked it up.
|
|
|
arkoma
Redneck Overlord
Posts: 1761
Registered: 3-2-2014
Location: On a Big Blue Marble hurtling through space
Member Is Offline
Mood: украї́нська
|
|
I love element 29. reduced Cu, CuSO4, and CuAc across top, and crystallizing CuCl2 on the glass. My lil Kodak doesn't focus
well close up *sigh* as the chloride is bee-you-ti-ful
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
|
|
|
Brain&Force
Hazard to Lanthanides
Posts: 1302
Registered: 13-11-2013
Location: UW-Madison
Member Is Offline
Mood: Incommensurately modulated
|
|
Element 28 is calling to me right about now...
here's some nickel sulfamate I'm probably going to use for electroplating. I just need to find a nickel electrode.
<img src="http://i.imgur.com/JHxrO6B.jpg" width=800>
At the end of the day, simulating atoms doesn't beat working with the real things...
|
|
|
Sulaiman
International Hazard
Posts: 3692
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Offline
|
|
For small scale nickel electrodes, http://www.ebay.co.uk/itm/30PCS-Pure-99-96-Low-Resistance-Ni...
|
|
|
cyanureeves
National Hazard
Posts: 744
Registered: 29-8-2010
Location: Mars
Member Is Offline
Mood: No Mood
|
|
been waiting for 1 1/2 months for
delivery of those nickel strips.have to wait until jan, 01 2016 before i ask for money back.
|
|
|
PHILOU Zrealone
International Hazard
Posts: 2893
Registered: 20-5-2002
Location: Brussel
Member Is Offline
Mood: Bis-diazo-dinitro-hydroquinonic
|
|
@Stibium,
Magnificent!
How did you do/make those? Via United State Patent n°US2544507A or else?
How is that phosphorescence activated, sunlight, UV light/laser and how long exposure?
How long does the phosphorescence lasts?
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
|
|
|
Texium
Administrator
Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
This evening I made some 3-nitrophthalic acid for future production of luminol. I noticed that one of the soluble byproducts of the nitration exhibits
yellow-green fluorescence. I got a good picture of it:
My tablet's camera makes the fluorescence appear more yellow than it does in person, it's actually quite green. By any chance, does anyone know what
the cause of it is?
|
|
|
PHILOU Zrealone
International Hazard
Posts: 2893
Registered: 20-5-2002
Location: Brussel
Member Is Offline
Mood: Bis-diazo-dinitro-hydroquinonic
|
|
Quote: Originally posted by zts16  | This evening I made some 3-nitrophthalic acid for future production of luminol. I noticed that one of the soluble byproducts of the nitration exhibits
yellow-green fluorescence. I got a good picture of it:
My tablet's camera makes the fluorescence appear more yellow than it does in person, it's actually quite green. By any chance, does anyone know what
the cause of it is? |
Could it be m-nitrophtalic acid or m-nitrophtalate anion?
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
|
|
|
Texium
Administrator
Posts: 4580
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
There's definitely a substantial amount of 4-nitrophthalic acid in that solution, but I don't know if that's what is causing the fluorescence. I
haven't been able to find much out there about its properties. It might also be a trace amount of a dinitrophthalic acid, as I did unfortunately allow
the temperature to rise too high for about half a minute during the nitration.
|
|
|
| Pages:
1
..
38
39
40
41
42
..
77 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
