Ammonium hydroxide appears as a clear colourless aqueous liquid. The concentration of ammonia ranges up to approximately 30%. Ammonia (NH3) is a simple chemical compound composed of one nitrogen atom (N) covalently bonded to three hydrogen atoms (H).
APPARATUS
a). 5 ml stoppered weighing bottle.
b). 250 ml conical flask.
c). 100 ml measuring cylinder.
d). Burette.
REAGENTS
a). Standard 1(N) hydrochloric acid (HCl) solution.
b). Bromo cresol green indicator.
ASSAY PROCEDURE OF AMMONIA
Take an aqueous ammonia sample in a 5-ml stopped-weighing bottle.
Carefully transfer about 1 gm (weighing accurately) sample from the weighing bottle into a 250-ml conical flask.
Add about 100 ml of distilled water and shake well to ensure thorough mixing.
Titrate against standard 1(N) HCl solution taken in a burette using bromoeresol green as an indicator. 1 ml 1(N) HCl = 0.01703.gm NH3
Ammonium hydroxide formula = NH4OH
Assay of Ammonia solution (%) = Titre value (ml) x normality HCl x 1.703
Wt of Ammonia sample taken (gm)
Molar Mass of Ammonia
To calculate ammonia's molar mass, add the atomic masses of each element in the molecule.
Nitrogen (N): 14.01
Hydrogen (H): = 3.03
Total molar mass of ammonia = 14.01 + 3.03 = 17.03 g/mol
Therefore, the molar mass of ammonia is 17.03 g/mole.