The nitric oxide is reacted in the presence of water to produce nitric acid.

Nitric acid and ammonia are used to make ammonium nitrate.

This material is a good fertilizer component because it has a high concentration of nitrogen.

Plants take up nitrogen from the soil in the form of ammonium ions (NH4) and nitrate ions, and along with carbon containing molecules made during photosynthesis

these ions are used to synthesize amino acids, from which proteins are made. Within the past hundred years the demand for nitrogen fertilizers has grown dramatically as the need for fertilizers for agriculture has grown. The natural manner in which nitrates reach the soil involves the reaction of nitrogen gas and oxygen gas in the atmosphere to form nitrogen dioxide gas (NO)

then reacts with atmospheric water, making nitric acid, which provides a natural source of nitrates in water and soil.

Ref credits: Acido nitrico - Azoto, fertilizzanti, nitrati e ioni - Articoli JRank http://science.jrank.org/pages/4676/Nitric-Acid.html#ixzz5Mn3rlDih

C1 V1 = C2 V2

per supporre, 100ml di acido nitrico 0.5% devono essere preparati, e 'q' è la quantità (in ml) di acido nitrico 69% richiesto, calcoliamo la 'q' dall'equazione sopra.

0,5 X 100 = 69 X q

q= 50/69 = 0,7246 ml

quindi, 0,7246 ml di acido nitrico al 69% aggiunto con 99,275 ml di acqua forma 100 ml di acido nitrico allo 0,5%.