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You tried to read the thermometer when your solution containing the unknown began to freeze but...

You tried to read the thermometer when your solution containing the unknown began to freeze but were not certain if the reading was 43.5 degrees celsius or 44.0 degrees celsius so you decided to repeat this by remelting the solidifying mass. The new reading you observed was clearly 41.0 degrees celsius. What happened?
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There is difference in the freezing temperature of the mixture. The freezing temperature of the mixture decreases. This can be attributed to the presence of impurities in the unknown substance the presence of impurities leads to freezing temperature depresion
* This can also be due to the hygroscopic nature of the unknown substance
* or due to the decomposition of the sample during the phase tranfer
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