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video How to Make Ammonium Nitrate
In this video we make ammonium nitrate from various off-the-shelf chemicals.
Note: This is not cheaper than buying it directly, once again our objective is to explore the chemistry.
Warning: The chemicals are corrosive and ammonia has a horrible smell, work outside or in a fumehood and wear gloves.
First get 138 grams of sodium bisulfate and add just enough water to dissolve it, usually 300mL.
Then get one mole equivalent of a pure nitrate salt. Some common salts include:
Sodium nitrate: 85 grams.
Potassium nitrate: 101 grams.
Calcium nitrate: 118 grams (if using tetrahydrate)
Dissolve the nitrate in a minimum of water, then mix the two solutions together.
Neutralize the mixture with ammonia (using a pH meter to determine the endpoint).
Filter the mixture to get rid of any insoluble materials if needed, then boil until sodium sulfate begins to precipitate. Then cool the mixture to 0 Celsius and filter. Dry the filtrate to obtain ammonium nitrate mixed with some leftover metal sulfates.
For higher purity the solids can be mixed with 500mL of methanol which selectively dissolves ammonium nitrate. Filter again and evaporate the filtrate to obtain pure ammonium nitrate.
Note: This is not cheaper than buying it directly, once again our objective is to explore the chemistry.
Warning: The chemicals are corrosive and ammonia has a horrible smell, work outside or in a fumehood and wear gloves.
First get 138 grams of sodium bisulfate and add just enough water to dissolve it, usually 300mL.
Then get one mole equivalent of a pure nitrate salt. Some common salts include:
Sodium nitrate: 85 grams.
Potassium nitrate: 101 grams.
Calcium nitrate: 118 grams (if using tetrahydrate)
Dissolve the nitrate in a minimum of water, then mix the two solutions together.
Neutralize the mixture with ammonia (using a pH meter to determine the endpoint).
Filter the mixture to get rid of any insoluble materials if needed, then boil until sodium sulfate begins to precipitate. Then cool the mixture to 0 Celsius and filter. Dry the filtrate to obtain ammonium nitrate mixed with some leftover metal sulfates.
For higher purity the solids can be mixed with 500mL of methanol which selectively dissolves ammonium nitrate. Filter again and evaporate the filtrate to obtain pure ammonium nitrate.
How can i test if my ammonium nitrate fertiliser its good enough to make sodium nitrate and potassium nitrate?(it was delivered with no info and in a normal bag without no brand name)
and
How can i purify my ammonium nitrate fertiliser without using methanol(rare and expensive in my country)?
saying "go past pH7" is easier to remember since everyone inherently thinks pH 7 is neutral. Since extra ammonia doesn't hurt the process i thought it would be ok to simplify it down that way.
But you are 100% correct, the actual equivalence point is somewhere below 7.