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Gravimetric analysis

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weam samy

on 6 May 2014

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Transcript of Gravimetric analysis

Presentation
Of
Gravimetric Analysis

Graveimetrc analysis
It is a set of methods used in
analytical
chemistry
for the quantitative determination of an analyte based on
mass of solid.
Analyte
is referred as substance that
cannot be measured but measurable
property of the analyte can be measured .
For example
:
it is quite challenging to measure glucose
in the blood but one can measure
the glucose concentration in blood by
using
gravimetric factor
.

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
by difference.

Procedure of the analysis:
1)
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.
3)
Now you need to start with precipitating the
analyte, for which you have to add an
excessive precipitating reagent.
4)
Once you add the precipitate,
filter the whole mixture to isolate from the
precipitate solution.
5)
There are chances of impurities in the precipitate so wash the precipitate throughly
to remove the same.
6)
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

7)
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

9)
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
Advantages :
Disadvantages :
Our Group:
Mohamed Reda
13389
Ahmed Mostafa
13419
Esraa Mohamed abd al aziz
13192
Weam Samy
13477
Yassmen Essam
13516
http://www.ibuzzle.com/articles/gravimetric-analysis.html
http://WWW.ecs.umass.edu/cee/reckhow/courses/572/572bk15/572BK15.htl
http://ull.chemistry.urkron.edu/analytical/103-Gravimetry.pdf
Analytical chemistry - Gravy D.Christain 5th edition,page no 145-168
en.wikipedia.org/wiki/gravimetry .
Our references
Thank you :)
Best wishes of success.
Terminology
of

Gravimetric
Gravi =
weighing
metric=
measure
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
technique
Full transcript