NSCI 3022 Study Guide - Midterm Guide: Distillation, Fractional Distillation
7 Oct 2015
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Determine an unknown compound based on melting points. The mp of ? is in the range of a . If the mp of the mixture is lowered then ? is not x . If the mp does not change then ? is the same compound as x . We first used trans-cinnamic acid and urea to observe mp. The mixture of urea and trans-cinnamic acid (ca) had lower mp than either pure substance. This is bc the weak bonds between the different substances break first, causing the substance to start to melt. If the mel-temps is not regulated slowly, then the mp range will be skewed. It takes the substance longer to heat up than the substance, and the thermometer takes longer to heat up than the substance. To determine what our unknown was, got a rough mp range. Compared w/ list of compounds and their mp"s. Made a 50:50 mixture of the unknown with the possible compounds.
