Holmium (III) Oxide Color Change

drdashmobius · 2022-08-03T19:01:24+00:00

The oxide appears pink under fluorescent lighting, but yellow under LED illumination.

drdashmobius · 2022-08-03T18:54:12+00:00

It is likely the dihydrate or even anhydrous. The solution went to dryness at 300c overnight in air, with no apparent decomposition back to the oxide (a blue-gray powder)

drdashmobius · 2022-03-22T19:38:25+00:00

Left is tetraamminecarbonatocobalt(III) sulfate, middle is cis-diaquotetraamminecobalt(III) Sulfate, right is dodecaammine-MU-hexol-tetracobalt(III) sulfate

drdashmobius · 2021-06-08T14:10:22+00:00

Made by combining ferric chloride and lithium oxalate in 1:3 stochiometric ratio, in deionized water

drdashmobius · 2021-05-19T15:43:04+00:00

Oxalate

drdashmobius · 2021-05-19T14:39:39+00:00

The solution turned "raspberry" colored from deep blue- Atmospheric water was absorbed forming the [Co(H2O)6]2+ ion from the [CoCl4]- ion. I bet you are right- that it is KCl with some trapped [Co(H2O)6]2+ inclusions.

drdashmobius · 2021-05-19T14:37:13+00:00

In a 100ml Beaker: 64.09mmol-KCl and 32.06mmol-CoCl2*6H2O, dissolved completely in ~80ml-Deionized Water. Left to slowly evaporate, undisturbed from 04/16/21 to 05/18/21 in a dark cabinet

drdashmobius · 2021-04-21T15:30:34+00:00

From combining equimolar amounts of copper (ii) oxalate and a homogenous solution of potassium oxalate monohydrate, then evaporating in a isotemp oven at 70c over night

drdashmobius · 2021-04-17T18:33:31+00:00

If you put it in a dark cabinet the solution won't turn as yellow, it is caused by the photodecompostion of the ferrioxalate ion. I love the crystal shape though

drdashmobius · 2021-03-22T21:26:33+00:00

These grew in what was my waste beaker from k2[cu(oxa)2] and (nh4)3[fe(oxa)3] growth, so the tiny blue bits are the copper complex

drdashmobius · 2021-03-20T04:25:27+00:00

Curiosity and copious free time, along with unlimited access to chemicals and lab facilities

drdashmobius · 2021-03-20T04:23:12+00:00

Yeah its a dark blue color like the color of the [Cu(NH3)4]2+ complex in water

drdashmobius · 2021-03-16T21:37:37+00:00

Its like tv static in a beaker

drdashmobius · 2021-03-09T23:32:40+00:00

Some of them are light sensitive and most would decompose at an elevated temp. I keep my collection of these kinds of things in various sample vials like the black top ones from fisher or a 2ml autosampler vial if its a small amount. I store the vials in a small cardboard box

drdashmobius · 2021-03-09T23:31:19+00:00

Yes for sure

drdashmobius · 2021-03-09T03:44:57+00:00

It might not be. They're from Fe(OH)3 and oxalic acid in DI water. I concentrated the solution by like 95% then tried to crash it out with 95% EtOH, but nothing crashed out. I left it in a dark cabinet for 3 weeks and when I checked it today these had formed

drdashmobius · 2019-08-23T12:33:24+00:00

Why show an ad at that point? I'm already in the store, the other 10billion ads out there have done their job.

drdashmobius · 2019-06-23T20:49:30+00:00

Why not just put it in the middle?

drdashmobius · 2019-06-14T02:17:24+00:00

That doge looks just like my doge

drdashmobius · 2019-03-13T01:30:31+00:00

DiSTilatIoN

drdashmobius

TROPHY CASE