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Transcript of Gravimetric analysis
It is a set of methods used in
for the quantitative determination of an analyte based on
mass of solid.
is referred as substance that
cannot be measured but measurable
property of the analyte can be measured .
it is quite challenging to measure glucose
in the blood but one can measure
the glucose concentration in blood by
The Process of this analysis involves
isolating the ions in the substance
using precipitation reaction,
then filtering and washing the
precipitate to remove the impurities,
and then converting a precipitation
into a measurable compound
and then finally weighing it to
determine its mass
Procedure of the analysis:
At first you need to weigh the sample or substance that need to be analyzed.
2 )If the substance is not in the soluble state, then dissolve it in the suitable solvent.
Now you need to start with precipitating the
analyte, for which you have to add an
excessive precipitating reagent.
Once you add the precipitate,
filter the whole mixture to isolate from the
There are chances of impurities in the precipitate so wash the precipitate throughly
to remove the same.
Now you have to dry the precipitate. The general method for drying the precipitate is by
heating it. The heating process removes the water from the precipitate completely
Before the mixture catches
any moisture from the surroundings
it is ideal to cool it down in a dessicator.
8)Now, weigh the cooled substance and note it down on a piece of paper. Repeat the drying and weighing process till you get the constant mass of the precipitate
Now, subtract the mass of the crucible from the
combined mass, which will give you the mass of the
mass of the analyte in the actual sample
of the precipitate, you can easily calculate the
precipitated analyte. Once you get the composition
Esraa Mohamed abd al aziz
Analytical chemistry - Gravy D.Christain 5th edition,page no 145-168
Thank you :)
Best wishes of success.
require accurate weighing
scrupulously clean glassware
careful and time consuming
require good technique
it is accurate and precise
depends only on mass measurement
require no standards
accuracy depend on your