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Ammonia or azane is a compound of nitrogen and hydrogen with the formula NH 3. It is a colourless gas with a characteristic pungent smell. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers.mmonia is miscible with water. In an aqueous solution, it can be expelled by boiling. The aqueous solution of ammonia is basic. The maximum concentration of ammonia in water (a saturated solution) has a density of 0.880 g/cm 3 and is often known as '.880 ammonia'.
H2O + CO2 <---> H2CO3. H2CO3 is known as carbonic acid, and is the reason tap water is slightly acidic. The more CO2 dissolved into the water, the more acidic the water gets. pH can get as low as pH 5, though usually it is just over pH6.