when removing the water of crystalisation, you are required to heat till constant weight. what does that mean?
2006-08-27 08:22:15 · 6 answers · asked by whack 1 in Science & Mathematics ➔ Chemistry
The weight of a sample includes the weight of any water of crystallization that is contained in the sample.
When you heat a sample, some of the water of crystallization is driven off by the heat, making the sample lighter. Adding more heat drives off more water making the sample lighter still.
After a time there is no water left to drive off, so the weight of the sample does not change, even when more heat is added.
Hope this helped.
2006-08-27 08:26:42 · answer #1 · answered by Carbon-based 5 · 0⤊ 0⤋
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2016-12-29 12:31:21 · answer #2 · answered by ambach 3 · 0⤊ 0⤋
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2016-10-25 08:59:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
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2016-04-02 05:15:05 · answer #4 · answered by ? 4 · 0⤊ 0⤋
This is used in analytical chemistry and the heating until constant weight is to certify that all crystallization water has been removed.
2006-08-27 08:36:47 · answer #5 · answered by DONN 3 · 0⤊ 0⤋
basically you're trying to drive off all the water so you heat the bejesus out of it until no more mass is removed (water)
2006-08-27 10:40:53 · answer #6 · answered by shiara_blade 6 · 1⤊ 0⤋