ammonia Flashcards
what are the reactants involved in prep of ammonia
slaked lime (Ca(OH2)) and Dry NH4Cl ( Sal ammoniac )
why is a higher ratio of alkali used?
to counteract the loss of nh4cl by sublimation on heating in solid state
why is slaked lime used in prep of nh3
cheap and not deliquescent
ammonium nitrate isn’t used
explosive nature, may decompose to give nitrous oxide and water vapour
round bottom flask is inclined
so that water vapour doesn’t trickle back and crack the apparatus
why is CaO used for drying NH3
basic and doesn’t react with basic nh3
how is ammonia collected and why
downward displacement of air because it is lighter that air.
why is nh3 not collected over water
highly soluble
why is nh3 usually not prepared using metal nitride? give an example with formula
because nitrides are expensive.
Mg3N2 + 6H2O→3Mg(OH)2 + 2NH3
eq of habers process
N2 + 3H2 → 2NH3
Conditions for habers process
temp : 450 to 500°C
pressure : 200 to 900 ATM
catalyst used in habers process
Fe
promoter used in habers process
molybdenum
precautions taken during habers process
impurities such as CO2,COand H2S can poison the catalyst Hensel the reaction mixture must be free of them
how is nitrogen obtained for habers process
fractional distillation of liquid air
