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Question about a solution evaporating

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XxslbabesxX:
A 1.00 L sample of saturated Ag3PO4 solution is allowed to evaporate at 25 degrees Celsius to a final volume of 500 mL. What is [Ag+] in the solution? Justify your answer.

I thought the [Ag+] would be doubled since the moles per liter of Ag3PO4 would have increased and therefore producing more of its products. However, I was told the answer was that the [Ag+] would remain the same in a saturated solution of Ag3PO4 since it is independent of the volume of the solution. I don't get this. Can someone please help me out? Thank you.

Borek:
Solution was saturated! Concentration can't rise as it will have to get oversaturated.

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