Write 2 equations for the interaction of phosphoric acid with a salt to get a precipitate and a gas.

H3PO4 is phosphoric acid. Inorganic acid. To determine orthophosphoric acid in solutions, an interaction reaction with silver nitrate is used. As a result of the reaction, a yellow precipitate forms. This precipitate indicates the presence of orthophosphoric acid, with other acids the precipitate is white. The reaction produces silver phosphate and ammonia. The second reaction is phosphoric acid and sodium carbonate, resulting in sodium phosphate salt, water and carbon dioxide.

H3PO4 + 3 AgNO3 = 3 HNO3 + Ag3PO4

2 H3PO4 + 3 Na2CO3 = 2 Na3PO4 + 3 H2O + 3 CO2.