.A solution is 0.10 M in Ag+, Ca2+, Mg2+, and Al3+ ions. Which compound will precipitate
first when a solution of Na3PO4 is added?
A) Ag3PO4 (Ksp = 1 × 10-
16)
B) Ca3(PO4)2 (Ksp = 1 × 10-33)
C) Mg3(PO4)2 (Ksp = 1 × 10-24)
D) AlPO4 (Ksp = 1 × 10-20
To determine which compound will precipitate first when Na3PO4 is added, we need to find the one with the highest Ksp value. The Ksp value represents the solubility product constant, which indicates the degree of solubility of a compound in water. The higher the Ksp value, the less soluble the compound is and the more likely it is to precipitate.
Comparing the Ksp values given:
A) Ag3PO4 (Ksp = 1 × 10-16)
B) Ca3(PO4)2 (Ksp = 1 × 10-33)
C) Mg3(PO4)2 (Ksp = 1 × 10-24)
D) AlPO4 (Ksp = 1 × 10-20)
We can see that the Ksp value for Ag3PO4 is the highest at 1 × 10-16. Therefore, Ag3PO4 will precipitate first when Na3PO4 is added.
The correct answer is A) Ag3PO4.