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The Volatile Chemist
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How'd you make it? Or do you own phosphoric acid...?
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Texium
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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.
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Zephyr
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I made it by reacting copper carbonate with phosphoric acid and drying it slowly in a desiccator over sodium hydroxide.
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Texium
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Perhaps it is a soluble acid salt then, like CuHPO4
Analyzing the ratio of phosphate ions to copper ions in it would clarify it.
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The Volatile Chemist
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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...
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arkoma
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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
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The Volatile Chemist
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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?
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plastics
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Just trying out my 'new' reconditioned Edwards 2 stage vacuum pump
[Edited on 24-11-2015 by plastics]
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The Volatile Chemist
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Wow, very nice. Is that just the readout, or the entire device?
Did you purchase it new, or did you 'acquire' it used?
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CrystalCage
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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.  )
  
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The Volatile Chemist
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Nice. What's the second crystal inside of?
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CrystalCage
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It is potassium alum crystal.
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LargeV
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He asked what you were storing the crystal in the second picture in
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CrystalCage
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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]
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stibium
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Phosphorescent alkaline earth sulfides activated with bismuth.
From left to right:
BaS / SrS / CaS
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Dmishin
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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]
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CrystalCage
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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.
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arkoma
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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
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Brain&Force
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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...
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Sulaiman
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For small scale nickel electrodes, http://www.ebay.co.uk/itm/30PCS-Pure-99-96-Low-Resistance-Ni...
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cyanureeves
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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.
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PHILOU Zrealone
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@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)
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Texium
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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?
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PHILOU Zrealone
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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)
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Texium
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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.
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