Silver nitrate upon reduction with sodium formaldehydesulfoxylate
changed to gray fluffy precipitate
in about 30 min. The solution did not turn pink when
no formaldehyde was added and the reaction was
This confirmed that the oxidation
of formaldehyde perhaps played role in precipitating
finer particles. The most significant condition
however has been that the pH of the reaction medium
was less than 5 at all time and still favouring fast
completion. pH upon completion of the precipitation
was found to be about 2 when measured by pH
meter.