How to Prepare Different Ammonia Solutions
Ammonium sulfate
Formula: (NH4)2SO4
Molar mass: 132.14 g/mol
IUPAC ID: Diazanium sulfate
Melting point: 235 °C
Density: 1.77 g/cm³
Classification: Sulfates
How to Prepare 0.25M, 0.5N Ammonium
sulfate.
Dissolve 33 g of (NH4)2SO4 in 1 liter of water.
How to Prepare Ammonium Sulfide, colorless,
1.) 3 M.
Treat 200 ml of conc. NH4OH with H2S until saturated, keeping the solution
cold. Add 200 ml of conc. NH4OH and dilute of 1 liter.
2.) 6 N. Saturate 6 N Ammonium Hydroxide (40 ml conc.
ammonia solution +60 ml H2O) with washed H2S gas. The ammonium hydroxide bottle
must be completely full and must be kept surrounded by ice while being
saturated (about 48 hours for two liters). The reagent is best preserved in
brown, completely filled, glas-stoppered bottles.
Ammonium
sulfide, yellow:
Treat 150 ml of conc. NH4OH with H2S until saturated, keeping the solution
cool. Add 250 ml of conc. NH4OH and 10 g of powdered sulfur. Shake the mixture
until the sulfur is dissolved and dilute to 1 liter with water. In the solution
the concentration of (NH4)2S2, (NH4) 2S and NH4OH are 0.625, 0.4 and 1.5 normal
respectively.
On standing, the concentration of (NH4)2S2 increases and that of
(NH4)2S and NH4OH decreases.