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-----Nitric acid titration
How can we carry out nitric acid titration perfectly?
i.e. against which solution and using which indicator exactly?
We are titrating it against sodium carbonate?and methyl orange
⇦ on
eBay or
Amazon [affil link]
indicator.
Is it perfect?/
student - India
February 13, 2009
Methyl orange ⇦ on eBay or Amazon [affil link] is a good indicator. You do need to proceed slowly as you near the end point and you do need to have good mixing, or the pH will change after you have met the end point color change. This assumes that all of the carbonate is dissolved before you start the titration, or that you go very slow. I like it better than phenolphthalein.
James Watts- Navarre, Florida
It would be good to know what else is in the solution.
If there are metals such as Fe or Cu then they will tend to precipitate near the endpoint and redissolve.
methyl orange
⇦ on
eBay or
Amazon [affil link]
is an OK indicator for this pH change 3.2-4.4 but many males with colour insensitivity find the endpoint difficult to see.
Personally I would prefer sodium hydroxide as the titrant and maybe bromophenol blue
⇦ on
eBay or
Amazon [affil link]
3.0-4.6 as the indicator
Geoffrey Whitelaw
- Port Melbourne, Australia
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