How to Prepare Different Ammonia Solutions

How to Prepare Different Ammonia Solutions

Ammonium sulfate
Ammonium sulfate, (NH₄)₂SO₄, is an inorganic salt with a number of commercial uses. The most common use is as a soil fertilizer. It contains 21% nitrogen and 24% sulfur.Wikipedia
Formula: (NH₄)₂SO₄
Molar mass: 132.14 g/mol
IUPAC ID: Diazanium sulfate
Melting point: 235 °C
Density: 1.77 g/cm³
Soluble in: Water
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.

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