Ana Chem Midterms Flashcards
the analyte is
converted to a soluble precipitate.
Precipitation method
the analyte or its
decomposition products are volatilized at a
suitable temperature
Volatilization method
gravimetric precipitating agent
should react
Specifically
Sumarry of steos in precipitation gravimetry
precipitation
Digestion
Filtration
Drying
Precipitates made up of___ particles are
generally desirable in gravimetric work
Large
solid made up of particles having
diameters that are less than 10-4 cm.
Colloid
Coagulation can be hastened by ——,——,—-
Heating, stirring and ading electrilytes
Larger particles can also be obtained by
Ph control
is a process in which a substance (gas,
liquid, or solid) is held ON the surface of a solid
aDsorption
Coagulation of a colloidal suspension can often be
brought about by
short period of heating and stirring
is a process by which a coagulated
colloid returns to its dispersed state.
Peptization
Colloids are best precipitated from hot, stirred
solutions containing sufficient electrolyte to
ensure coagulation
True
four types of coprecipitation
Surface adsorption, mixed crystal formation, occlusion, and mechanical entrapmnt
is a process in which normally
soluble compounds are carried out of solution
by a precipitate.
Coprecipitation
common source of coprecipitation
Adsorption