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vano

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posted on 3-3-2021 at 04:24

Ni, Co and Cu tungstates.

Hi. I made Ni, Co and Cu tungstates. Cobalt has very beautiful colour. I wondered how different the color was from Co selenite.

[Edited on 3-3-2021 by vano]

Lion850

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posted on 3-3-2021 at 11:44

Hi Vano was there meant to be photos included with your post? I do not see any.

EDIT: I see it now! Lovely.

[Edited on 3-3-2021 by Lion850]

Below pic of the cobalt tungstate I made - slightly different shade. It was dried on a steam bath which 'faded' the color a bit.

[Edited on 3-3-2021 by Lion850]

Bedlasky

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posted on 3-3-2021 at 13:48

Lion850: This colour difference is due to water content. Look at cobalt chloride: hexahydrate is red, dihydrate violet, anhydrous dark blue.

vano

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posted on 3-3-2021 at 21:20

Lion850 As always your compounds are beautiful. I agree with Bedlasky. I think if we put both in water and dry equally they will be the same color. How long have you been drying tungstate?

Lion850

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posted on 4-3-2021 at 12:15

Hi Vano looking back at my log from September last year it was on the steam bath for around 3 hours. By then the weight loss rate reduced to near zero. Here you can see the colour of the ppt before drying.

Edit: Green is my favourite colour, after seeing your photo I must try copper tungstate sometime! But, I have not managed to make a bright red compound yet, and that is my holy grail! I got close a few times, but no pure bright red yet.

[Edited on 4-3-2021 by Lion850]

vano

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posted on 4-3-2021 at 12:50

As I recall, mine also had such a color.I dried it for hours at 60-80 degrees, I had no set time. It is good that you like colored compounds. I don't remember why I fell in love with chemistry, but colors would be one of the factors. Copper tungsten will be good for your collection. Which red compound do you plan to make?

If you have reagents I would recommend making this compound. I want to use chlorate instead of perchlorate.
https://zh.wikipedia.org/wiki/%E9%AB%98%E6%B0%AF%E9%85%B8%E5%85%AD(%E4%BA%8C%E7%94%B2%E5%9F%BA%E4%BA%9A%E7%A0%9C)%E5%90%88%E9%92%B4(II)

ChemTalk

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posted on 4-3-2021 at 19:16

Quote: Originally posted by vano

If you have reagents I would recommend making this compound.

Thanks for the link Vano, it looks explosively beautiful!
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ChemTalk
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vano

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posted on 4-3-2021 at 21:38

Yes i agree. I like DMSO complexes, but i have only copper chloride complex, but it is also nice green or yellow compound.

Lion850

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posted on 28-3-2021 at 22:28

I wanted to see the color of gallium tungstate; turned out white (which was disappointing but not a not a surprise) and while I had a solution of sodium tungstate I checked the reactions with some other metal nitrate solutions. Below photos show the ppt colors, apologies some are not so good quality but good enough to show the color trend:

Gallium nitrate + sodium tungstate = white