Posted by Lindsay on Thursday, February 5, 2009 at 12:19am.
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!! :)
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