unit 4 - how to pass: gravimetric analysis Flashcards
What can gravimetric analysis be used for?
To determine the mass of an element or compound in a substance.
What is the substance converted into?
Another substance of known chemical composition, which can be readily isolated and purified.
How can the conversion occur?
Through precipitation or volatilisation.
In precipitation conversion, what happens to the precipitate?
It is separated from the filtrate and the filtrate tested to ensure the reaction has gone to completion. It is washed, dried to constant mass and then weighed.
In volatilisation conversion, what happens to the substance?
It is heated and any volatile products, often water, are evaporated. The substance is heated to constant mass and the final mass recorded.