A precipitate is formed when the two solutions, barium nitrate, Ba(NO3)2, and phosphoric acid, H3PO4, are mixed. Identify the correct products for this reaction.
A)
BaHa & NPO4
B)
BazN2 & HNO3
Baz(PO4)2 & NO2
D)
Baz(PO4)2 & HNO3

d. Ba₃(PO₄)₂(s)+6HNO₃(aq)

Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product  

To predict whether this reaction can occur or not is one of them, the precipitation reaction. A precipitation reaction occurs if two ionic compounds which are dissolved reacted to produce one of the products of the ion compound does not dissolve. Formation of these precipitating compounds that cause reactions can occur  

Because A precipitate is formed, then compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ + are generally included in the insoluble compound

So the reaction :

3Ba(NO₃)₂(aq)+2H₃PO₄(aq)⇒Ba₃(PO₄)₂(s)+6HNO₃(aq)

A precipitate is formed ⇒ Ba₃(PO₄)₂