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mahacrown
#1 Posted : Thursday, July 12, 2018 3:58:37 PM
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Hi!

One question from the AAMC prep test asked "What volume of a .0120 M CaI2 solution would contain 0.078 mol of the solute. The correct answer was 650mL, which means they considered the Ca2+ ion as the solute. In this case why would that be the solute and not the I- ions. It was a standalone question, and I believe if we take iodine as the solute we would get a smaller volume as a result because each mole of the molecule would give 2 mols of iodine ions

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faisaluddin
#2 Posted : Tuesday, July 17, 2018 8:45:33 PM
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Hi mahacrown,

They are actually considering whole CaI2 compound as the "solute." Generally, the question should be more clear when talking about solutes but the AAMC decided to be vague with this question. They should specify "moles of ion X" to be more clear.

Based on this, the answer should be 650 mL as you have found.

When you read the question and it is referring to "the" solute, as in just one solute, it probably is safe to assume they are referring to the original compound as a whole.
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