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Answer to Question #30669 in Other Chemistry for Kel

Question #30669
Which pair of solutions will produce a precipitate when they are mixed?
a. calcium chloride and sodium sulfate
b. magnesium sulfate and zinc(II) nitrate
c. sodium phosphate and lithium chloride
d. lead(II) nitrate and potassium phosphate
Expert's answer
a. Na2SO4(aq) + CaCl2(aq) --> CaSO4(s) + 2NaCl(aq)
Calcium sulfate is insoluble in H2O.
b. No reaction, so no equation. All the possible salts are soluble.
c. No reaction, so no equation. All the possible salts are soluble.
d. Molecular Equation:
K3PO4(aq) + Pb(NO3)2(aq) --> KNO3(aq) + Pb3(PO4)2(s)
Net Ionic Equation:
PO43- + Pb2+ → Pb3(PO4)2
Pb3(PO4)2 is insoluble in H2O.

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