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Bronze + Nitric acid = ???


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#1 anthropos

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Posted 31 July 2005 - 12:46 PM

When bronze is completely dissolved in nitric acid, what colour would the solution be?

Is it light blue, because after the reaction, lead (II) nitrate and copper (II) nitrate are formed (I SUPPOSE). As the former is white and the latter is blue, is it light-blue? o_0

Then name one chemical and describe the test that could be used to determine the presence of copper and tin in solution E.

Um...for this question, I am clueless! Does tests which work on solid tin and copper work on aqueous ones?

Thanks, guys!
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#2 kingjewel1

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Posted 31 July 2005 - 12:58 PM

The thing is, neither copper nor tin will react in your nitric acid. It's to do with the nitrate anion's complexing abilities. And so its size.
If however you manage it.
For the copper, you can add excess ammonia solution and you'll get a dark blue solution.
Where do you get the lead from? Test for lead nitrate, hmmm if i remember rightly (sorry long time now) gives a yellow ppte with excess ammonia which does not dissolve.

No test for tin that i can think of.
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#3 anthropos

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Posted 31 July 2005 - 01:16 PM

whoops, lead is a typo error! sorry :( Should have check my post before submitting. :D
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#4 YT2095

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Posted 31 July 2005 - 04:54 PM

yes it will be light blue (depending on the conc).
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#5 anthropos

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Posted 1 August 2005 - 02:44 AM

However, in this website, it claims that when nitric acid reacts with bronze, the colour will be green. o_0 so I am rather puzzled.

http://www.sacskyranch.com/metfram.htm
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#6 YT2095

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Posted 1 August 2005 - 07:37 AM

green is perfectly acceptable also, what you have to consider is the percentages used in the alloy, there are different types of "Bronze" and the concentration of the soln, nothing to worry about :)
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#7 anthropos

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Posted 1 August 2005 - 07:58 AM

Oh, I see...I am enlightened! Thanks a lot! :D
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#8 Primarygun

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Posted 1 August 2005 - 10:23 AM

However, in this website, it claims that when nitric acid reacts with bronze, the colour will be green. o_0 so I am rather puzzled.

Copper reacts with concentrated nitric acid to form a bluish-green solution.
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#9 anthropos

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Posted 1 August 2005 - 01:13 PM

hmmm...okay...**batting my eyelids**
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