Unknown Substances: The Evaporation Of Ethanol

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The data of all three unknown solutions resulted in measurements that were all off by at least 7% of the theoretical percentages. For example, the 1st unknown solution was supposed to consist of about 30% Ethanol and around 70% N-Propanol, though the actual data we received put Ethanol at 20% and N-Propanol at around 80%. This 10% margin of error could have been caused by a multitude of mistakes including the liquid evaporating before it was injected, cross-contamination, bubbles within the needle, and students not clicking the button simultaneously as they injected the alcohol. Our teacher warned us about how quickly the alcohols evaporated from the needle and told us to keep our hands at the back of the syringe to prevent as much evaporation

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