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Author Topic: what causes the dark color that is formed when AgCl is exposed to light?  (Read 4508 times)

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dhouse0610

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what causes the dark color that is formed when AgCl is exposed to light?
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dhouse0610

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Re: what causes the dark color that is formed when AgCl is exposed to light?
« Reply #1 on: December 06, 2009, 08:34:15 AM »

I am writing a lab report and there is a question that asks what causes the dark color  that is formed when AgCl is exposed to light?

I have looked around on the internet but I cannot seem to find the reason as to why. I think that it is due to the photodecomposition of AgCL but I am not sure.

Could you please help?
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baboom

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Re: what causes the dark color that is formed when AgCl is exposed to light?
« Reply #2 on: December 06, 2009, 09:10:16 AM »

Hi,

The dark colour is the result of the photodeomposition of the AgCl in the precence of organic compounds. The purple colour is elemental silver.
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baboom

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Re: what causes the dark color that is formed when AgCl is exposed to light?
« Reply #3 on: December 12, 2009, 02:49:54 PM »

Standard silver nitrate solution and the silver chloride precipitates formed were protected
from light at all times because silver chloride decomposes according to:
AgCl---> Ag(s) + ½ Cl2 (g)
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