- Solutes Name Sodium Chloride Solvents Name Structure Structure Na Ci Water Ho Br Dibromobenzene Ethanol Ch3ch2oh Br Oh B 1 (65.86 KiB) Viewed 76 times
Read the material in your general chemistry text about the relationship between solubility and intermolecular forces. Prepare a table in your notebook with the names, structures and melting points of the solid solutes. Also include a column analyzing the polarity of the molecule by considering the structure. (Classify them as very polar, somewhat polar or non- polar.) Also indicate what types of intermolecular forces are present in each structure. You may want to do this directly on the structure of the molecule to indicate which part of the molecule is responsible for which intermolecular forces. As in question two, prepare a table in your notebook but this time for solvents. Replace the column of melting point information with a column for boiling point information for each of these liquids. As above, analyze the polarity and intermolecular forces. Consider the melting points and boiling points in your tables above. a. Which solute/solvent pairing will cause the solute to melt at the solvent's boiling point? (Note that melting is not the same as dissolving, so this is an important pair to carefully observe when you run this test to be certain you don't confuse melting with dissolving. If a sample only melts but does not dissolve, you will see a separate molten organic layer floating on the solvent.) b. Which solvent(s) are most likely to evaporate quickly when heated to 80°C? (These solvents will require care to avoid loss of volume during heating. To properly assess solubility, you need to maintain the specified volumes.)