Info: 1. Obtain 15.0 mL each of silver nitrate and sodium chloride solutions . A
ID: 1032729 • Letter: I
Question
Info:
1. Obtain 15.0 mL each of silver nitrate and sodium chloride solutions . Add approximately 25 mL of 6 M aqueous ammonia
2. Add approximately 25 mL of 6 M nitric acid and stir.
Q:
a. Write the net ionic equation for the reaction (which involves one of the species in the reaction that you’ve just written) that occurs when aqueous ammonia is added to the beaker (1). According to Le Châtelier’s principle, why does the precipitate dissolve upon addition of ammonia?
b. Write the net ionic equation for the reaction that occurs when nitric acid is added to the beaker (2). Explain why the precipitate reappears upon addition of nitric acid.
Explanation / Answer
a) AgNO3(aq) + NaCl(aq)---> AgCl(s)+ NaNO3(aq)
Net ionic
Ag^+ + Cl^- ---> AgCl(s)
AgCl(s)+NH3(aq)----> Ag(NH3)2Cl (aq)
Ag(NH3)2Cl (aq) +2HNO3(aq) --->AgCl (s)+ 2NH4NO3 (aq)
Precipitate of AgCl is white that reappears on addition of HNO3
Net ionic:
Ag(NH3)2^+1 + 2H^+ --->AgCl(s) + 2NH4^+