| 2. With
ammonium chloride
The metal hydroxide is acting
as an alkali. When reacted with ammonium
chloride, ammonia gas is produced. The other
products are salt and water.
|
 |
|
NaOH + NH4Cl
NaCl + H2O
+ NH3 |
3.
With carbon dioxide
Reaction 1 : The metal hydroxide reacts
with the carbon dioxide to produce the metal
carbonate and water. When potassium is the metal
the potassium hydroxide produced is not very
soluble and forms a white precipitate. This is
the standard test for carbon dioxide gas. It is
known as the lime water test.
|
 |
|
2NaOH + CO2
Na2CO3
+ 2H2O |
Reaction 2 : If carbon dioxide continues
to be passed through the solution it will react
with the metal carbonate forming the metal
hydrogen carbonate. The metal hydrogen carbonate
is soluble. Any precipitate formed during
reaction 1 will slowly dissolve as the metal
carbonate is converted to the metal hydrogen
carbonate.
|
 |
|
Na2CO3
+ CO2 +
H2O
2NaHCO3 |
|
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