Aqueous Ammonia Purity Testing Method | Ammonium Hydroxide Purity

Ammonium hydroxide appearance as a clear colorless 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). 


a). 5 ml stoppered weighing bottle.

b). 250 ml conical flask.

c). 100 ml measuring cylinder.

d). Burette.


a). Standard 1(N) hydrochloric acid (HCl) solution.

b). Bromo cresol green indicator.


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 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 = 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 the molar mass of ammonia, add up 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.

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