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#Post#: 2053--------------------------------------------------
how would you prevent nitric acid solution from changing color?
DIR By: Michel
Date: February 7, 2013, 10:21 pm
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Normal bench concentrated nitric acid solution will soon change
color to yellowish. I presume this is because it gives off NO2
fumes, and probably the fumes dissolve in the nitric acid
solution...Firstly, am i correct?. then how could we prevent
this unfavorable reaction from occuring?
#Post#: 2054--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Shiva
Date: February 7, 2013, 11:09 pm
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Yes, you are correct. It depends on what sort of bottle you are
using? Usually, light sensitive chemicals (some acids, many
organic compounds, silver salts etc...) do come in brown bottles
as it prevents photochemistry from occurring (absorbing almost
all the light). If you use clear glass bottle, these chemicals
will decompose rapidly.
Shiva
#Post#: 2057--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: suzidemello
Date: February 8, 2013, 4:12 am
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:o Never knew that....
#Post#: 2063--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Michel
Date: February 9, 2013, 12:52 am
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Really? I Never knew the reaction is photocatalysed...so do you
store your Nitric acid in amber bottles?
#Post#: 2082--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Shiva
Date: February 10, 2013, 4:06 am
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Yep, mine is dark brown in color. However, fuming Nitric acid is
quite dangerous in this case. It is usually coming in brown
bottles too but still it decomposes on standing above 273 K and
releases Nitrogen dioxide. For this reason, fuming nitric acid
is usually yellow in color no matter what container you stored
in. Because, at higher concentration, the decomposition mainly
depends on temperature.
Shiva
#Post#: 2083--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Michel
Date: February 11, 2013, 1:08 am
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Hmmn...do you have any special uses of fuming nitric acid in
your lab? I understand that storing fuming HNO3 isn't the nicest
idea for a chemist ;)
#Post#: 2085--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Shiva
Date: February 11, 2013, 1:19 am
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No, I do not have fuming nitric acid. If I feel I can't manage a
chemical, I won't buy it.
#Post#: 2086--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Michel
Date: February 11, 2013, 1:53 am
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hahaha...of course this is very sensible! Experience can be a
bad teacher!
#Post#: 2087--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Shiva
Date: February 11, 2013, 2:08 am
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hehe yep. I'm happy with 70%. In fact, handling nitric is
tougher than handling sulfuric acid because of its strong
oxidizing properties. You know I got a chance to buy Phosphorus
pentoxide for a cheaper rate. But, I ignored the offer hahaha.
Phosphorus pentoxide is such a weird chemical and do not want to
play with it :)
Shiva
#Post#: 2091--------------------------------------------------
Re: how would you prevent nitric acid solution from changing
color?
DIR By: Michel
Date: February 11, 2013, 7:32 am
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--- Quote from: Shiva link ---
>
> hehe yep. I'm happy with 70%. In fact, handling nitric is
tougher than handling sulfuric acid because of its strong
oxidizing properties. You know I got a chance to buy Phosphorus
pentoxide for a cheaper rate. But, I ignored the offer hahaha.
Phosphorus pentoxide is such a weird chemical and do not want to
play with it :)
>
> Shiva
>
--- End Quote ---
Would you mind explaining how Phosphorus pentoxide is a wierd
chemical....you mean toxic?
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