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5/28/2018 Analisis Gravimetri (1)
1/13
Gravimetric Analysis
SMK Negeri 13 Bandung
5/28/2018 Analisis Gravimetri (1)
2/13Teknologi dan Rekayasa
After this session the students are expectedto be able :
Objectives.
1. explain the definition of analysis, chemical analysis andgravimetric analysis
4. explain the condition of gravimetric analysis
2. explain the steps of quantitative analysis
3. explain the advantages of gravimetric analysis
5. distinguish the separation process in gravimetric
analysis6. explain the condition of precipitate in gravimetricanalysis
5/28/2018 Analisis Gravimetri (1)
3/13Teknologi dan RekayasaTeknologi dan Rekayasa
What is gravimetric analysis?
What is analysis?
What is Chemical analysis?
5/28/2018 Analisis Gravimetri (1)
4/13Teknologi dan RekayasaTeknologi dan Rekayasa
Chemical nalysis
Thedetermination ofits element may
contain
Composition are:
Qualitativewhat
Quantitative
how many
Jobs todeterminate the
chemicalcompositionof
matter.
Resolution of achemical compoundinto its proximate or
ultimate parts
5/28/2018 Analisis Gravimetri (1)
5/13Teknologi dan Rekayasa
1. Sampling
2. Transform the
target element
to a measurable
form
3. Measurement4. Calculation
5/28/2018 Analisis Gravimetri (1)
6/13Teknologi dan Rekayasa
By Volume
By Weight
5/28/2018 Analisis Gravimetri (1)
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Quantitative analysis by weight withthe steps :
.Isolating
Weighing
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1. The separation is complete
no ion remind or less than 0,1
gram
2. The element or compound of theelement separated is pure
3. The element or compound is in
the definite form.
5/28/2018 Analisis Gravimetri (1)
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a. accurate and precise
b. sources of error are
readily checked
c. absolute method (direct
measurement)
d. inexpensive apparatus
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(a)standard to be used for thetesting and/or calibration ofinstrumental techniques;
(b) high accuracy, although thetime-consuming limits thisapplication
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Teknologi dan Rekayasa
a. Precipitation methodsb. Volatilization or evolution
methodsc.
Electro analyticalmethodsd. Extraction and
chromatographic methods.
The separation process
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Teknologi dan Rekayasa
The precipitate must be
1. insoluble2. readily separatedfrom the
solution by filtration, andcan be washed free ofsoluble impurities.
3. convertible into a puresubstance of definite chemicalcomposition
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Teknologi dan Rekayasa
Volatilization
1. Heating method- Lost on ignition- Humidity/volatile matter- Ash- TS/TDS
2. Chemical method- CO2liberating from carbonatecompound
CO3= H CO2 H2O
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