chemistry - 3d - gravimetric analysis

Question 1

What is gravimetric analysis used for?

Answer 1

To determine the mass of an element or compound in a substance.

Question 2

What is the substance converted into?

Answer 2

Another substance of known
chemical composition, which can be readily isolated and purified.

Question 3

How can conversion occur?

Answer 3

Either through precipitation or volatilisation.

Question 4

What happens in precipitation conversion?

Answer 4

The substance undergoes a precipitation reaction. The precipitate is separated from the filtrate and the filtrate tested to ensure the reaction has gone to completion. The precipitate is washed, dried to constant mass and then weighed.

Question 5

What happens in volatilisation conversion?

Answer 5

The substance is heated and any volatile products (often water) are evaporated. The substance is heated to constant mass and the final mass recorded.