Id of white solid - Andre Hinojosa 12601675 Lab Partner...

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Andre Hinojosa 12601675 Lab Partner: Chelsea Azevedo TA: Nick Barczak Chem51LA Identification of a White Solid In this experiment, we compared the melting points of different known solids to that of an unknown solid to find out the purity of the substance being tested. The concept of identifying compounds based on melting point is successful because a pure compound will only vary melting points between .5-2 ˚C. An impure compound will have a noticeably lower melting point due to the impurities in the crystal lattice, which weaken the compounds structure. We measured the melting points of benzoic acid/ salicylic acid, cinnamic acid/ urea, and unknown compound 40. By comparing the melting points we were able to discern the mystery substance. Benzoic acid and salicylic acid were both used as pure compounds to calibrate the thermometer. By comparing the actual known melting points to the recorded melting points we found in lab, we are able to graph the results and see how much the actual known temperatures vary from our recorded temperatures. For benzoic acid we recorded a temperature of 118˚C with
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