Chemistry Ksp Solution: Which salt precipitates first and what is the mini...

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Solution: Which salt precipitates first and what is the minimum concentration of Ag + necessary to cause this precipitation in a solution containing 7.5 mL of 0.025 M NaCl and 7.5 mL of 0.025 M Na3PO4?   (Hint: dilution occurs) Ksp(AgCl) = 1.8 x 10-10 Ksp(Na3PO4) = 1.3 x 10-20 a) AgCl              8.7 x 10  -7 M b) Ag3PO4         2.3 x 10  -7 M c) AgCl              1.4 x 10  -8 M d) Ag3PO4         7.2 x 10  -8 M e) None of these answers are correct