Growing Purer Precipitates

Growing purer precipitates depends on controlling how particles form in gravimetric analysis. The best conditions use a low concentration of the precipitating reagent and constant stirring. This keeps relative supersaturation low and helps large crystals grow.

Homogeneous precipitation uses a dif...

Slow addition of the precipitant in a dilute solution with constant stirring lowers the solute concentration, that is, Q, decreasing the relative supersaturation and increasing the particle size.

In homogeneous precipitation, the precipitant is slowly generated in situ, avoiding local reagent excesses. For example, urea decompose...