Micro-chemical test for ammonia: Difference between revisions
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Author: [[user:CBlaeuer| Christine Bläuer]]<br> | Author: [[user:CBlaeuer| Christine Bläuer]]<br> | ||
back to [[Micro-chemical testing]] | |||
More information about the necessary equipment and materials see Article Micro-chemistry. | More information about the necessary equipment and materials see Article Micro-chemistry. | ||
Principle | |||
== Principle == | |||
When dissolving a salt containing Ammonia in NaOH alkaline vapors extrivate having a typical odor and which will change the color of a previously wetted yellow pH indicator paper to green or blue. | When dissolving a salt containing Ammonia in NaOH alkaline vapors extrivate having a typical odor and which will change the color of a previously wetted yellow pH indicator paper to green or blue. | ||
Procedure | |||
== Procedure == | |||
Add a drop of caustic soda solution to a drop of the sample solution and immediately hold a wetted pH indicator paper directly above it into the extrivating vapors. | Add a drop of caustic soda solution to a drop of the sample solution and immediately hold a wetted pH indicator paper directly above it into the extrivating vapors. | ||
or | or | ||
put drop of caustic soda solution on an object slide and then put one grain of the salt into it. Hold a wetted pH indicator paper directly above the preparation into the extrivating vapors, while the salt is still dissolving. | put drop of caustic soda solution on an object slide and then put one grain of the salt into it. Hold a wetted pH indicator paper directly above the preparation into the extrivating vapors, while the salt is still dissolving. | ||
Indications from the pH-value of the salt solution | Indications from the pH-value of the salt solution. | ||
The pH value of an aqueous Nitrammite solution is slightly acidic (circa pH 5). If the sample solution is acidic this is no proof of Ammonium nitrate but it can be a first indication. | The pH value of an aqueous Nitrammite solution is slightly acidic (circa pH 5). If the sample solution is acidic this is no proof of Ammonium nitrate but it can be a first indication. | ||
Revision as of 11:56, 30 May 2012
Author: Christine Bläuer
back to Micro-chemical testing
More information about the necessary equipment and materials see Article Micro-chemistry.
Principle
When dissolving a salt containing Ammonia in NaOH alkaline vapors extrivate having a typical odor and which will change the color of a previously wetted yellow pH indicator paper to green or blue.
Procedure
Add a drop of caustic soda solution to a drop of the sample solution and immediately hold a wetted pH indicator paper directly above it into the extrivating vapors.
or
put drop of caustic soda solution on an object slide and then put one grain of the salt into it. Hold a wetted pH indicator paper directly above the preparation into the extrivating vapors, while the salt is still dissolving. Indications from the pH-value of the salt solution.
The pH value of an aqueous Nitrammite solution is slightly acidic (circa pH 5). If the sample solution is acidic this is no proof of Ammonium nitrate but it can be a first indication.
Literature
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