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July 20, 2025, 01:37:43 pm
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Author Topic: Copper wire  (Read 1502 times)  Share 

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DNAngel

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Copper wire
« on: March 05, 2011, 03:10:36 pm »
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For clarification:

Why would copper wire be unsuitable for use in flame tests? Is this due to its low melting point?
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nacho

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Re: Copper wire
« Reply #1 on: March 05, 2011, 03:49:05 pm »
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Perhaps expense? I'm not entirely sure though
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fady_22

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Re: Copper wire
« Reply #2 on: March 05, 2011, 04:19:10 pm »
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The copper, if used in flame tests, will actually produce its own characteristic colour which may mask the colour from the sample.
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DNAngel

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Re: Copper wire
« Reply #3 on: March 05, 2011, 04:23:12 pm »
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So its green colour would be so bright, that it would mask the sample's colour?
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fady_22

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Re: Copper wire
« Reply #4 on: March 05, 2011, 04:32:26 pm »
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If a green colour is produced by the wire, it may be more difficult to observe the colour produced by the sample. Simply, the two flames would "mix", changing the final colour. It's similar to having a contaminated wire, if that makes it more clear.

For example, if you had NaCl as the sample, the yellow colour would be very difficult to observe because of the presence of the green coming from the wire.
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Andiio

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Re: Copper wire
« Reply #5 on: March 05, 2011, 08:29:06 pm »
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Quote from: cherylim23 on March 05, 2011, 07:33:19 pm
(Correct me if I'm wrong) you have to use a one that has a colour that is complement of the colour that will be produced.
Also, as Cu is a transition element, it's melting point is even higher than that of those in Group I and II

I think the complementary colour pairs don't really apply to the flame test and moreso apply to the UV-visible/AAS tests. Not 100% sure on this though!
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schnappy

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Re: Copper wire
« Reply #6 on: March 06, 2011, 05:34:04 pm »
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Are you talking about testing copper by using a copper wire sample, or using apparatus made of copper wire to hold salts?
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