Title: melting and boiling point Objective: ? Introduction: include( info about

Question

Title: melting and boiling point Objective: ? Introduction: include( info about impurities, definition of melting and boiling point, the effect of impurities on melting and boiling point and does it change) Conclusion:? Experiment Two Melting and Boiling Points Data Sheet Name Laboratory Section t of p-dichlorobenzene 26 1. Melting Point of p-dichlorobenzene 2. 3. 4. Melting Point of acetamide Melting Point of solid mixture Boiling Point of acetone 55,20 53.32 4. Boiling Point of acetone55C Sa'yo Boiling Point of ethyl alcohol 26C Point of ethyl ohol C . Boiling Point of acetone/ethyl alcohol mixture -92-

Explanation / Answer

impurities: are substances that are included in the solution in a minor quantity and will affect many of th ephysycal and chemical properties due to its presence. Some impurities may be inert (chemically) but will still affect physical properties.

Melting point - the point in which a solid turn to a liquid (physical change)

Boiling point- the point in which a liquid turn into a gas (physycal change)

The effect of impuritites is

- The heat capacity of impurity will be different of that of the pure substance we are analyzing

- There may be interactions between the pure substanc e+ inpurity which may change the boiling/melting ponit

- Interactions such as bonding, Hydrogn bonding, london dispersion forces etc.

Conclusion

As aI compare with your values (1-6) all are either slightly high or slighltly lower than the actual values. this may be due to:

- Incorrect operation/handling in the lab

- Incorrect calibration/ not function of equipment and measureing devices

- Impurities of substances

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