double replacement 1. hydrogen sulfide is bubbled through a solution of silver nitrate. 2. an excess of sodium hydroxide solution is added to a solution of magnesium nitrate. 3. solutions of sodium iodide and lead nitrate are mixed. 4. a solution of ammonia is added to a solution of ferric chloride. 5. solutions of silver nitrate and sodium chromate are mixed. 6. excess silver acetate is added to a solution of trisodium phosphate. 7. manganese(ii) nitrate solution is mixed with sodium hydroxide solution. 8. a saturated solution of calcium hydroxide is added to a solution of magnesium chloride. 9. hydrogen sulfide gas is added to a solution of cadmium nitrate. 10. dilute sulfuric acid is added to a solution of barium acetate. 11. a precipitate is formed when solutions of trisodium phosphate and calcium chloride are mixed. 12. a solution of copper(ii) sulfate is added to a solution of barium hydroxide. 13. equal volumes of dilute equimolar solutions of sodium carbonate and hydrochloric acid are mixed.