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OpenStudy (anonymous):
why is it necessary to heat a mixture to determine the empirical formula?
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OpenStudy (camerondoherty):
When you heat a mixture to find out what is in it you are trying to remove anything with a lower boiling point. This is one of many methods used based on the physical properties of the substances in the mixture. A magnet would remove iron. It's not always ncessary. Source: http://www.chacha.com/question/why-was-it-necessary-to-heat-the-mixture-in-order-to-determine-the-empirical-formula
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