Ammonium chloride: Difference between revisions

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====with ammonium carbonate====
=====with ammonium carbonate=====
Bubble [[carbon dioxide]] through a saturated solution of [[sodium chloride]] and [[ammonium carbonate]], shortcutting the above, producing  [[ammonium chloride]] and [[sodium bicarbonate]]:
Bubble [[carbon dioxide]] through a saturated solution of [[sodium chloride]] and [[ammonium carbonate]], shortcutting the above, producing  [[ammonium chloride]] and [[sodium bicarbonate]]:
: {{#Chem: 2 NaCl + (NH4)2CO3 + CO2 + H2O = 2 NaHCO3(s) + 2 NH4Cl}}
: {{#Chem: 2 NaCl + (NH4)2CO3 + CO2 + H2O = 2 NaHCO3(s) + 2 NH4Cl}}
=====with ammonium bicarbonate=====
Bubble [[carbon dioxide]] through a saturated solution of [[sodium chloride]] and [[ammonium bicarbonate]], shortcutting the above, producing  [[ammonium chloride]] and [[sodium bicarbonate]]:
: {{#Chem: NaCl + (NH4)HCO3 = NaHCO3(s) + NH4Cl}}


====via hydrochloric acid====
====via hydrochloric acid====

Revision as of 08:17, 19 February 2021

 
Ammonium chloride
aka Sal ammoniac
Chemical formula NH4Cl
OTP appearance white/clear crystals 
Index of refraction 1.642 
Molar Mass(g/mol) 53.49 
Density(g/cc) 1.5274 
Melting Point(°C) 338(decomp) 
Boiling Point(°C) 520 
Solubility in water(g/L) 383 
Solubility in ethanol(g/L) 4.25 
Solubility in methanol(g/L) 23.7 
Solubility in ether(g/L) insoluble 
Solubility in acetone(g/L) sparingly
NFPA 704
NFPA704.png
0
2
0
 

Uses

Other

Natural occurrence

  • Does occur naturally as the mineral sal ammoniac

Hazards

Production

Extraction

Synthesis

via sodium chloride

with ammonia

Bubble carbon dioxide through a solution of sodium chloride, ammonia, and water, producing ammonium chloride and sodium bicarbonate[1][2][3]:

NaCl(aq) + NH3(aq) + H2O(l) + CO2(g) NaHCO3(s) + NH4Cl(aq)
  1. Prepare an ammonia solution with a density of 0.907 (25% w/w) at 20°C
  2. Heat the solution to 40°C
  3. Add an excess of Salt
  4. Decant/filter solution
  5. Discard residue (undissolved salt)
    Solution is NH4OH + NaCl + NH4Cl + NaOH
  6. Chill to -11°C
  7. Precipitate is ammonium chloride (Approximately 10% w/w of the saturated salt solution)
  8. Solution is NH4OH + NaCl + NaOH with some remaining dissolved ammonium chloride, and weighs approximately 90% of the original saturated salt solution.


with ammonium carbonate

Bubble carbon dioxide through a saturated solution of sodium chloride and ammonium carbonate, shortcutting the above, producing ammonium chloride and sodium bicarbonate:

2 NaCl + (NH4)2CO3 + CO2 + H2O 2 NaHCO3(s) + 2 NH4Cl
with ammonium bicarbonate

Bubble carbon dioxide through a saturated solution of sodium chloride and ammonium bicarbonate, shortcutting the above, producing ammonium chloride and sodium bicarbonate:

NaCl + (NH4)HCO3 NaHCO3(s) + NH4Cl

via hydrochloric acid

Combine ammonia and hydrochloric acid

NH3 + HCl NH4Cl

via calcium chloride

(or magnesium chloride)

  1. Bubble carbon dioxide through a solution of ammonia and magnesium or calcium chloride, precipitating magnesium or calcium carbonate:
    2 NH3 + CaCl2 + H2O + CO2 2 NH4Cl + CaCO3
  2. Filter
  3. Discard residue
  4. Evaporate filtrate to crystallize ammonium chloride

Purification

Sublimation/dissociation

This could also replace the evaporation iterations in the synthesis. Ammonium chloride dissociates (reversibly) into ammonia and hydrogen chloride at 337.6 °C. If the gases are cooled on a surface, they react to re-form ammonium chloride, so placing a cold boiling flask over a beaker of solid ammonium chloride, then heating the beaker would transport just the ammonium chloride to the bottom of the flask.

Testing

Storage

Disposal

See Also

References