Lab 2: Melting Point Determination (PDF)

**LAB 2: Determination of the Melting Point of a Solid** **Zweede Lewis** **Organic chemistry II lab 2** **Lab partner: Sharon Makovore and Claire Madaudichie** **Unknown (X)** **Use the table above to determine the Unknown substance (X)** Determine the melting point of given solid substance (...

**LAB 2: Determination of the Melting Point of a Solid** **Zweede Lewis** **Organic chemistry II lab 2** **Lab partner: Sharon Makovore and Claire Madaudichie** **Unknown (X)** **Use the table above to determine the Unknown substance (X)** Determine the melting point of given solid substance (x). **(3 Point)** **Melting points** **Trial 1** **Mean Melting point** = (t1+t2)/2 0C 72+79 =151 151/2 = 75.5 0C **Trial 2** **Mean Melting point** = (t1+t2)/2 0C 73+82 = 155 155/2 = 77.5 ^0^C **Final Calculations** 77.5 + 75.5 = 153 153/2 = 76.5 ^0^C ***Final mean Melting point: 76.5*** ^0^C **Define the following terms** 1\. Finding the melting point serves as a rough guide to the relative purity of that substance 2\. it is useful in supporting the identification of a compound 3\. can help indicate the type of bonding in the substance whether ionic or covalent 4\. The melting point can help when designing synthesis routes and processing conditions. ***The purity of the compound:** the lower melting point of 75 compared to the expected melting point 80 may indicate that the compound is not pure. Impurities can lower melting point and broaden the melting range of a substance* ***Experimental error:** there could be improper experimental errors such as incorrect temperature measurements, improper sample preparation, or issues with the heating rate.* ***Compound characteristics:** if the compound is known to having specific melting point under ideal conditions, the deviation suggests that the sample may have undergone some changes such as degradation, or partial decomposition, which would definitely affect the boiling point by lowering it.*