AgNO3+NaCl═AgCl↓+NaNO3
170? 58.5 143.5 85?
17gz xy
170 17g = 143.5 x = 85y = 58.5 z
x= 14.35g y=8.5g？ Z = 5.85g
Therefore, the solute mass fraction of the obtained solution is 8.5g 80g+17g+104.35g? 14.35g× 100% = 4.5%；
② Set the mass w of sodium chloride to be added.
w+5.85g× 10 1000g× 100% = 15%
w=9 1.5g
The water demand is 200g-91.5g =108.5g..
Answer: ① The mass fraction of solute in the solution after complete reaction is 4.5%.
② Restore the used sodium chloride solution to its original state, and the added sodium chloride and water are 9 1.5g and108.5g respectively; They are;