| Pages:
1
..
59
60
61
62
63
..
77 |
Tsjerk
International Hazard
Posts: 3032
Registered: 20-4-2005
Location: Netherlands
Member Is Offline
Mood: Mood
|
|
Oops, I was confused and was thinking of salicylic acid, which could be made by hydrolysis of aspirin.
|
|
|
j_sum1
Administrator
Posts: 6335
Registered: 4-10-2014
Location: At home
Member Is Offline
Mood: Most of the ducks are in a row
|
|
Mixed chromium(III) waste in the bottom of a 1L beaker. It is deliquescent and has taken on a really glossy sheen.
|
|
|
HeYBrO
Hazard to Others
Posts: 289
Registered: 6-12-2013
Location: 'straya
Member Is Offline
Mood: 
|
|
Aspirin-->salicylic acid-->phenol
With phenol you can perform a Reimer-Tiemann reaction to get salicaldehyde. But I must admit, I don't know if anyone has actually done it on SM. But
all the reagents are OTC or can be made from OTC reagents.
|
|
|
Flagmat
Harmless
Posts: 1
Registered: 26-4-2018
Member Is Offline
Mood: No Mood
|
|
Milk and soap
|
|
|
Supersonic
Harmless
Posts: 3
Registered: 2-3-2017
Member Is Offline
Mood: God
|
|
Formates crystals
Quote: Originally posted by Hegi  | | Quote: Originally posted by Supersonic | | Quote: Originally posted by Amos | Copper(II) formate crystals. Their supernatant is the deepest of royal blues and yet the crystals are an icy-looking aqua color.
|
Large crystals have a nice form and beautiful color.
It`s a pity that they erodes even in warm air.
There crystals were synthesed from copper(II) hydroxide and formic acid.
|
Those are really beuatiful copper formate crystals. Especially, the second one is really big and it seems to be nicely shaped. What technique did you
use to grow it? I tried once but there was a problem with hydrolysis mostly and even in acidic environment the salt did not want to crystallize
easily. |
These crystals were grown with slow evaporation method during about 2-2.5 months. I`ve just put acidic solution into the plastic glassful and voila
It`s a pity that crystals slowly erodes in open air. I tried to save it in packet with zip lock, but after few months it was fully eroded and
crumbled.
I also tried some other formates. For example, crystals of calcium formate:
|
|
|
Texium
Administrator
Posts: 4619
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Crystals of sulfanilic acid that I prepared recently:
The light purple coloration is not inherent to the compound, but due to traces of polyanilines.
|
|
|
weilawei
Hazard to Others
Posts: 130
Registered: 3-12-2017
Member Is Offline
Mood: No Mood
|
|
Distillation of bromine from NaBr, TCCA, and HCl.
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
A very pretty picture, looks like fun. I appreciate the nice combination of a good nature and chemistry photo.
|
|
|
Boffis
International Hazard
Posts: 1879
Registered: 1-5-2011
Member Is Offline
Mood: No Mood
|
|
@ Supersonic, have you tried strontium formate? I believe the crystals are the dihydrate but they grow into large well formed blocky prisms. I can
remember growing them years ago.
|
|
|
Supersonic
Harmless
Posts: 3
Registered: 2-3-2017
Member Is Offline
Mood: God
|
|
@Boffis
Yes, I've grown few crystals of strontium formate. They have beautiful prismatic shape:
 
But it is hard to grow large monocrystal because of low solubility.
For me, it is more pleasant to grow strontium acetate, which mainly forms monocrystals and have arrow-like shape:
|
|
|
j_sum1
Administrator
Posts: 6335
Registered: 4-10-2014
Location: At home
Member Is Offline
Mood: Most of the ducks are in a row
|
|
I could do strontium acetate. I might have to try that.
|
|
|
CaCl2
Harmless
Posts: 39
Registered: 14-1-2017
Member Is Offline
Mood: No Mood
|
|
Some cesium copper chloride crystals
I first found out about cesium tetrachlorocuprate from this site when I was looking for a yellow compound for my collection of copper compounds
(posted earlier in this thread), at the time I didn't consider it as a candidate for crystallization.
Later, when I was looking for a new, interesting materials to grow crystals from, I decided to check if it would crystallize, and found a paper which said it would form yellow-orange crystals.
The compound doesn't contain water of crystallization, and seems to be air stable. It is also a very unusual color for a copper compound;
dichromate-like orange.
My first attempt produced nice, orange crystals, but later attempts also resulted in darker, brownish crystals of unknown composition forming. These
crystals turned more reddish and lost their transparency completely over time.
|
|
|
crystal grower
Hazard to Others
Posts: 474
Registered: 3-1-2016
Location: Os Petrosum
Member Is Offline
Mood: Puzzled
|
|
pH paper I got after filtering anthocyanins extract from roses. I just let it dry out and cut into stripes.
It's strong acid on the top then weak acid, weak base, strong base and the bottom is neutral.
|
|
|
crystal grower
Hazard to Others
Posts: 474
Registered: 3-1-2016
Location: Os Petrosum
Member Is Offline
Mood: Puzzled
|
|
Resublimed iodine crystals.
|
|
|
stamasd
Hazard to Others
Posts: 137
Registered: 24-5-2018
Location: in the crosshairs
Member Is Offline
Mood: moody
|
|
| Quote: Originally posted by crystal grower | First crystal of my CoSO4 solution prepared from CoCl2 + Na2CO3, then CoCO3 + H2SO4.
I'll try to make prettier crystals when the solution is all evaporated. |
Cobalt salts make some very aesthetically pleasing crystals. I've got a mess of similar crystals inside a vial of Co(NO3)2 saturated solution due to
partial evaporation.
|
|
|
stamasd
Hazard to Others
Posts: 137
Registered: 24-5-2018
Location: in the crosshairs
Member Is Offline
Mood: moody
|
|
| Quote: Originally posted by The Plutonium Bunny | Recently, I've been really interested in crystals of pure metals, mostly for my element collection. After being inspired by The Backyard Scientist's
video (see his post on page 23 of this thread), I decided to grow some of my own copper crystals. Over a period of six weeks, I used a 40g/L solution
of copper sulfate and two copper electrodes with a current of always less than 10mA to grow some truly amazing copper crystal clusters. Unlike nearly
all the other experiments I saw online, these crystals are very large and sharply defined - they are not nodules or rounded growths. I think that the
extremely low current and the very long growth time contributes to the crystalline nature of this growth.
I made a YouTube video about how I grew this, and I also included a 360° rotation to show the entire crystal. https://www.youtube.com/watch?v=zZniOJ7swic
Also, for those who might like to repeat this experiment (the crystal is truly stunning), I wrote an extensive post on my website with details on the
experiment. http://sciencewithscreens.blogspot.com/2016/06/experiment-53-growing-large-copper.html This post also has a link to my experimental data and
observations I recorded during the six-week period.
Finally, I also included the less-impressive picture of my first attempt. This used currents of around 20mA over two weeks, and I accidentally broke
the crystal. It's still pretty neat, though.
In the future, I will be trying other metals. Does anyone have experience with growing crystals of other metals? Thank you!
|
I like those crystals so much that I decided to make some of my own. And on the cheap. I repurposed a plastic take-out food container (that originally
had chicken tikka masala in it, thoroughly cleaned) and filled it almost to the top with CuSO4 80g/l (40g in 500ml solution, with dH2O) and a pinch of
sea salt. Electrodes made from 14 gauge copper wire (1.6mm) about 1m of it for the anode, short length for cathode. For the constant current source I
decided to go as simple as possible: a 5V wallwart, and a JFET+resistor. Essentially this (not my drawing):
Randomly chosen JFET from a big pile of them, measured IDSS=22mA; used a 150ohm resistor which resulted in 9.6mA constant current, perfect.
Will check again on it in a month or so.
|
|
|
wg48
National Hazard
Posts: 821
Registered: 21-11-2015
Member Is Offline
Mood: No Mood
|
|
Stamasd:
I thought constant current would tended to favour dendritic growth as the high points closer to the counter electrode hog the limited current and
hence grow faster. In addition its probably a function of the resistance of the solution (its concentration) and the distance to the counter electrode
relative to the height of crystal growth.
Borosilicate glass:
Good temperature resistance and good thermal shock resistance but finite.
For normal, standard service typically 200-230°C, for short-term (minutes) service max 400°C
Maximum thermal shock resistance is 160°C
|
|
|
stamasd
Hazard to Others
Posts: 137
Registered: 24-5-2018
Location: in the crosshairs
Member Is Offline
Mood: moody
|
|
We shall see. The author of the post I quoted (from 2 years ago) has had nice results with a similar setup. The electrolyte is quite concentrated and
has a low resistance (on the order of 0.5ohms) and the distance between anode and cathode is fairly large compared to the exposed surface of the
cathode (8cm vs 0.5cm) so I hope that the variations in current density at the cathode will be minor enough to not make a difference.
Again we shall see. It's an experiment; if it doesn't work I will try to change its conditions for the next time until it does.
Edit: here's what the cathode looks like after 2 days.
[Edited on 23-6-2018 by stamasd]
|
|
|
mayko
International Hazard
Posts: 1218
Registered: 17-1-2013
Location: Carrboro, NC
Member Is Offline
Mood: anomalous (Euclid class)
|
|
Uranium concentrates from various mines (mostly on and about the Colorado Plateau)
(ed: ?? has tweet embedding turned off ??)
[Edited on 7-7-2018 by mayko]
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
|
|
|
Abromination
Hazard to Others
Posts: 432
Registered: 10-7-2018
Location: Alaska
Member Is Offline
Mood: 1,4 tar
|
|
Boiling water off of copper (ii) acetate
List of materials made by ScienceMadness.org users:
https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
--------------------------------
Elements Collected: H, Li, B, C, N, O, Mg, Al, Si, P, S, Fe, Ni, Cu, Zn, Ag, I, Au, Pb, Bi, Am
Last Acquired: B
Next: Na
-------------- |
|
|
ThatBenzeneRing
Harmless
Posts: 5
Registered: 15-8-2018
Member Is Offline
|
|
My small copper collection. Belonging to me, ABROMINATION and not my backup account that im stuck with.
EDIT: of course I forgot to name them. From left to right:
Tetraamminediaquacopper dihydroxide, copper acetylsalysilate, copper acetate, copper borate, copper carbonate, copper sulfate and copper metal.
[Edited on 16-8-2018 by ThatBenzeneRing]
[Edited on 16-8-2018 by ThatBenzeneRing]
Heeeeeellllp!! I lost my main accounts password and forgot password wont work for gmail!!
-Abromination
Elements Collected: 12
Copper Compounds Collected: 8
THIS IS ABROMINATION!!!
|
|
|
The Volatile Chemist
International Hazard
Posts: 1981
Registered: 22-3-2014
Location: 'Stil' in the lab...
Member Is Offline
Mood: Copious
|
|
Abromination, that's a nice little collection going there. I like the vials you're using there - not quite 'chemistry lab spec' but I think they give
the collection a nice look - good photo.
|
|
|
DrScrabs
Hazard to Others
Posts: 123
Registered: 13-3-2018
Location: Laputa
Member Is Offline
Mood: Still evaporating..
|
|
Snails love ether
Its a bit rainy today so I went under the balcony and It seems that snails love ether. Two more were on the pot and two more on the way
|
|
|
fusso
International Hazard
Posts: 1922
Registered: 23-6-2017
Location: 4 ∥ universes ahead of you
Member Is Offline
|
|
| Quote: Originally posted by DrScrabs | Its a bit rainy today so I went under the balcony and It seems that snails love ether. Two more were on the pot and two more on the way
|
How come the snail don't have a shell?!
|
|
|
DrScrabs
Hazard to Others
Posts: 123
Registered: 13-3-2018
Location: Laputa
Member Is Offline
Mood: Still evaporating..
|
|
I´m sorry I used the wrong word, acually in english it´s called a slug or directly from german "nacked snail"
I do not know if you can find them on every continent but if you dont know how it feels to step barefoot on them, you didn´t miss anything in your
life 
Edit 1 I´ve added another pic so you can see where the beasts were coming from, guess the wind direction
Edit 2 Just went looking and added the secon snug pic...no more words...
[Edited on 24-8-2018 by DrScrabs]
|
|
|
| Pages:
1
..
59
60
61
62
63
..
77 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
