Gravimetry

Question 1

It is an analytical method which involves the measurement of the weight of the analyte or of a compound of known composition that contains the analyte

Answer 1

Gravimetry

Question 2

Why gravimetry is still in use, although time-consuming and challenging:

Answer 2

✅ Accurate and precise (if done properly)
✅ Absolute method: No calibration required
✅ Apparatus required is relatively inexpensive

Question 3

Types of Gravimetric Methods

Answer 3

Volatilization Gravimetry
Extraction Gravimetry
Electrogravimetry
Precipitation Gravimetry

Question 4

The analyte is separated as a gas from the remainder of the sample.

Answer 4

Volatilization Gravimetry

Question 5

The analysis is based upon the weight of the volatilized substance (direct analysis) or upon the mass of the non-volatile residue (indirect analysis).

Answer 5

Volatilization Gravimetry

Question 6

Classified under particulate gravimetry.

Answer 6

Extraction Gravimetry

Question 7

The analyte is extracted from the sample by using an appropriate solvent o solvent system.
o Example: Soxhlet Method

Answer 7

Extraction Gravimetry

Question 8

The analyte is deposited on the cathode.

Answer 8

Electrogravimetry

Question 9

The mass of the product deposited provides a measure of the analyte concentration.

Answer 9

Electrogravimetry

Question 10

The analyte is precipitated from the remainder of the sample then converted to some pure form that can be weighed.

Answer 10

Precipitation Gravimetry