unit 4 - how to pass: gravimetric analysis Flashcards

1
Q

What can gravimetric analysis be used for?

A

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

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2
Q

What is the substance converted into?

A

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

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3
Q

How can the conversion occur?

A

Through precipitation or volatilisation.

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4
Q

In precipitation conversion, what happens to the precipitate?

A

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.

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5
Q

In volatilisation conversion, what happens to the substance?

A

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

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