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Gravimetric Analysis

SMK Negeri 13 Bandung

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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

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What is gravimetric analysis?

What is analysis?

What is Chemical analysis?

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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

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1. Sampling

2. Transform the

target element

to a measurable

form

3. Measurement4. Calculation

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By Volume

By Weight

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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.

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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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Volatilization

1. Heating method- Lost on ignition- Humidity/volatile matter- Ash- TS/TDS

2. Chemical method- CO2liberating from carbonatecompound

CO3= H CO2 H2O