Gravimetric analysis

Heating to constant mass procedure

heating a substance, allowing to cool in a desiccator to prevent absorption of water, weighing, repeating the steps of heating, cooling and weighing until no further changes in mass are observed

Weighing accurately approximately

The exact mass should be known/measured and should be close to chosen mass

Heating to constant mass procedure

heating a substance, allowing to cool in a desiccator to prevent absorption of water, weighing, repeating the steps of heating, cooling and weighing until no further changes in mass are observed

Weighing accurately approximately

The exact mass should be known/measured and should be close to chosen mass

What is gravimetric analysis used for?

to determine the mass of an element or compound in a substance

Precipitation conversion

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

Volatilisation conversion

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

Weighing by difference

set balance to zero by using tare button. Record the weight of weighing boat. Add the substance being measured and reweigh. The difference between this value and mass of weighing boat is the mass of substance.