TBR GenChem Question

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Obi Wan

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I'm looking at Solutions for Passage VII for GenChem Ch. 1 (the passage about molarity, molality, mass % and density). This is for Question #41.

Why doesn't the density of the solution decrease when water is added? The answer key states that "when the aqueous solution has a density of less than 1.00, the density increases when water is added." Shouldn't density decrease, because volume of solution is increasing?

Thanks guys.

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Solution with density less then one should have some water (with density~1) and some light compound (density<1). Adding water you adding the heavy compound. So the total density should increase.
 
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Temperature variations probably wouldn't noticeably change the density either, really, at least not in the direction of becoming more dense.
 
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