posted by Lindsay on .
considering the polarity of each compound and that of a solvent in which it is dissolved (including the potential for hydrogen bonding), give a brief explanation of each result:
a) malonic acid in water
- which i know is soluble
b) malonic acid in hexane
- which is also soluble
c) malonic acid in methyl alcohol
- which is partially soluble
please help.... i don't know how explain the reactions other then the solubilities
Here is what you are doing. Remember that like dissolves like. That is the same as saying that polar molecules will dissolve in polar solvents and non-polar molecules will dissolve in non-polar solvents. For example, NaCl is an ionic compound which means it is quite polar. It dissolve in a polar solvent like water BUT will not dissolve in hexane, pentane, etc because they are non-polar solvents and NaCl is a polar solute. By the same reasoning, hexane, a non-polar solvent, will dissolve octane, a non-polar solute, but hexane will not dissolve NaCl. Now you look at malonic acid which is an organic molecule with a chain of CH3-CH2...etc and ends in COOH. The COOH is a polar group so you would expect it to dissolve in water. Etc.
thank you!! that really helps me with the other problems also!! :)