chem help

Test Preparation AP Test Preparation
1

<p>This is a question from the 2004 chem frq:</p>

<p>In a saturated solution of Ag3PO4 at 25 degrees C, the concentration of Ag+(aq) is 5.3 * 10^-5M.</p>

<p>g. A 1.00L sample of saturated Ag3PO4 solution is allowed to evaporate at 25 degrees C to a final volume of 500.mL. What is [Ag+] in the solution? Justify your answer.</p>

<p>i thought that since volume decreased by half and the number of moles of Ag+ stayed the same, [Ag+] would double. however, according to the scoring guidelines, [Ag+] should remain constant because “[Ag+] in a saturated solution of Ag3PO4 is independent of the volume of the solution.” Why?</p>

2

<p>Because the solution is saturated, so the concentration will be the same no matter how much solvent it has. Like the solute will solidify to maintain the concentration. i m not good at explain things, hope you get what i meant.</p>

3

<p>that makes sense. thanks</p>

4

<p>on the FRQ part B (non calculator part), can we still go back to part A (calculator part) just w/o a calculator?</p>