Colorful Metal Salts: What Concentration?

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ikrase
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Joined: Tue May 13, 2008 3:22 am UTC

Colorful Metal Salts: What Concentration?

Postby ikrase » Fri May 06, 2011 12:08 am UTC

I'm going to be giving a presentation to elementary school children about ultra-ultra-basic atomic structure with the hook of why things have different colors. This is going to involve colorful fire (flame tests!) , neon-type lights (Gas Discharge Tube!) and colored liquids (Hey, I took the d-Block of the Periodic Table and dissolved each metal in a separate vial of acid!).

Well, not the whole d-Block. But definitely I will have visibly colored solutions of Zn2+, (colorless), Cu2+ (nice blue), Fe2+, and possibly also Co2+ and/or Mn2+. Thing is, I do not know what concentration to use, and I am required to know what concentration I am going to use before touching the chemicals. What's a good concentration for the salts of these metals that will provide clearly colored solution? Most are going to be sulfates, I think. I've been researching for a while and have not found much.
[bibliography]XKVCBDOSLDMSD[/bibliography]

p1t1o
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Location: London, UK

Re: Colorful Metal Salts: What Concentration?

Postby p1t1o » Fri May 06, 2011 10:56 am UTC

0.1M should do you, that is around the 10-20 grams (read: 3-4 teaspoons) per litre mark depending on what salts you will be using, but it should be enough to give a coloured solution.

Possibly useful.

ikrase
Posts: 319
Joined: Tue May 13, 2008 3:22 am UTC

Re: Colorful Metal Salts: What Concentration?

Postby ikrase » Fri May 06, 2011 10:50 pm UTC

Thank you. That's a huge help.
[bibliography]XKVCBDOSLDMSD[/bibliography]

mbrigdan
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Re: Colorful Metal Salts: What Concentration?

Postby mbrigdan » Sun May 08, 2011 1:46 am UTC

If you're alright with having a sealed one that you'd need to keep an eye on, Cu2+ and ammonia make a lovely shade of blue.
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opsomath
Posts: 89
Joined: Wed Nov 01, 2006 1:58 pm UTC

Re: Colorful Metal Salts: What Concentration?

Postby opsomath » Thu May 12, 2011 6:59 pm UTC

Meh. Just a couple drops of household ammonia into cupric sulfate (available at the hardware store) should be enough for a good color, and that is a concentration something like that of Windex. No danger.


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