AH Chemistry - Unit 3 - (d) - Gravimetric Analysis

How do you weigh by difference?

To weigh by difference you:

• The mass of the weighing container and sample are measured accurately

• The sample is transferred then the weighing container measured when empty

What does weighing by difference take account of?

Weighing by difference takes account of any mass not transferred.

What does weighing accurately approximately mean?

Weighing accurately approximately means the exact mass is known and is close to the desired mass.

What is heating to constant mass?

Heating to constant mass is when you:

• Heat a substance

• Allow the substance to cool in a desiccator to prevent absorption of water

• Weigh the substance

• Repeat the steps of heating, cooling, and weighing until no further changes in mass are observed.

What can gravimetric analysis be used to determine?

Gravimetric analysis can be used to determine the mass of an element or compound in a substance.