Homework Help: chemistry

Posted by alexis on Monday, July 21, 2008 at 7:14pm.

Polymers are high molecular weight compounds with a repeating structural unit. Polystyrene has the formula (CH CHZ) , where Z is C H and n is an integer. where n is 576
A solution of polystyrene in a solvent is prepared. Would you select H O, ethanol (CH CH OH), or toluene (C H CH ) as the solvent for the solution? Briefly justify your choice.

chemistry - DrBob222, Monday, July 21, 2008 at 7:38pm
I don't understand your nomenclature (you appear to have omitted the subscripts) but use the same answer from your last post. Like dissolves like. Wouldn't you expect toluene to be more like polystyrene than ethanol or water?
- chemistry - alexis, Monday, July 21, 2008 at 8:18pm
  why? aren't they all polar, does it depend on how polar each compound is?
chemistry - DrBob222, Monday, July 21, 2008 at 10:27pm
yes and yes.
Water is polar, ethanol is a little less polar, and toluene is only slightly polar (next to hexane which is non-polar).

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