The nitric acid reacts with other ions that might precipitate with silver nitrate. Doing this first gets these other unwanted precipitates out of the way. If you are testing with Fluoride as your halide remember that silver nitrate does not precipitate with Fluoride, so no precipitate does not mean that halide ions are not present.
To form an insoluble silver halide.
The Niritric acid is used to remove any ion without will contaminate the reaction. for example if there is any carbonate (CO3) then the nitric acid will react with it: 2 HNO3 (aq) & (CO3)-2 (aq) --> CO2 (g) & H2O (l) & 2 (NO3)- (aq)
The presence of halide ions
the solution changes to a white percipitate. Ionic Equation= Ag(+) + 2Cl(-) -----> AgCl(2) === ===
If you think to a solution of silver nitrate dissolve the powder in water.
To form an insoluble silver halide.
The Niritric acid is used to remove any ion without will contaminate the reaction. for example if there is any carbonate (CO3) then the nitric acid will react with it: 2 HNO3 (aq) & (CO3)-2 (aq) --> CO2 (g) & H2O (l) & 2 (NO3)- (aq)
The presence of halide ions
The product is a silver halide insoluble in water.
iron nitric + silver
the solution changes to a white percipitate. Ionic Equation= Ag(+) + 2Cl(-) -----> AgCl(2) === ===
If you think to a solution of silver nitrate dissolve the powder in water.
hyoliulo
confusion
Silver is soluble in Nitric Acid producing silver nitrate.
When making photographic film, silver nitrate is treated with halide salts of sodium or potassium to form insoluble silver halide in situ in photographic gelatin, which is then applied to strips of tri-acetate or polyester. AgNO3 + NaCl -------->AgCl(s) + NaNO3 .
Wrong ! ! ! ! !Silver + Nitric Acid -----> Silver Nitrate + Water + Nitrogen DioxideAg + 2 HNO3 -----> AgNO3 + H2O + NO2