Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
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hydroxyl amine hydrochloride : NH2OH.HCl
sodium nitrite : NaNO2
Class:
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elem=N
redox
Summary:
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Hydroxyl ammonium ion and nitrite ion, when brought together give rise to
formation of dinitrogen oxide and under certain condition also NO can be
formed.
Description:
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Dissolve some sodium nitrite in a little amount of water. Dissolve some
hydroxyl ammonium chloride (a.k.a. hydroxyl amine hydrochloride) in another
test tube in a small amount of water. Pour the one solution into the test tube
with the other solution: Initially, nothing seems to happen, but after a minute
or so, the liquid starts bubbling gently. Slowly the rate of reaction increases
and at a certain point in time the reaction becomes really vigorous! The liquid
also becomes hot. The evolved gas is colorle
Bring a burning spint of wood or a burning tight roll of paper in the test
tube with the gas: The burning rate visibly increases for a while. The gas
produced in the reaction is N2O.
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Mix some solid sodium nitrite and solid hydroxyl ammonium chloride in a test
tube: Initially, nothing seems to happen, but after a few tens of seconds a
roaring and hissing noise is produced and a lot of gas is produced as well. The
gas mix in the test tube becomes pale brown.
Again, a test with a burning spint of wood shows that the gas supports
combustion, somewhat better than air does. The gas mix must be mostly N2O.
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The main reaction in this experiment is: NH3OH(+) + NO2(-) --> N2O + 2H2O