From: mhchong6 (mhchong6$##$yahoo.com)
Date: Fri Dec 01 2006 - 23:50:46 EST
Hi,
This is a chemistry question from one of my friend. Anybody can solve this? Thanks in advance.
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Hi,
This is a chemistry question from one of my friend. Anybody can solve this? Thanks...
Note: forwarded message attached.
---------------------------------
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attached mail follows:
Hi all,
I need some info on the chemical reaction of some material. Pls help.
This problem has been tortured me for months. I still can't figure out
the root behind it. It is a real chemistry stuff.
1. This mixed chemical - HNO3 (29%conc) : HCOOH : H2O ratio 10:20:3
%vol to react with Ag & NiV.
The problem that I face is sometimes some portion of the metal seems not
able to be removed. The material is put on a spinning surface with the
chemical spray that covered full length from left to right of the whole
surface.
Can anyone figure out the chemical reaction between this mixed solution
with NiV and Ag? What I'm more interested is initially the chemical is
1:2 HNO3:HCOOH without adding the water. Then, my superior was
accidentally found out the water did help to solve the problem. But we
still can't figure out the correct or optimum concentration to be used.
Anyway, this doesn't seem to work out now.
2. If I want to analyze the chemical composition of the acid, what
possible method can I use? If titration, what chemical or medium to be
used? I want to try to check out the chemical composition after the
reaction, so I need to figure out the balance chemical equation 1st.
3. This reaction is aim to remove metal NiV and Ag. But when I
repeat the same experiment (with same concentration & amount of
chemical), I can't obtain the same etchrate or thickness being removed.
I can't understand why the reaction shifted so much or unstable.
Anything else that I can do to stabilize the reaction? This reaction is
operated at a control temperature 40degC. Do you think any different btw
open tank and a closed tank? And direct heating Vs indirect heating by
heat exchanger with water tube?
Thanks.
Regards,
Mulan
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