Question

1.Solid ammonium sulfide is slowly added to 150 mL of a 0.0663 M zinc nitrate solution. The concentration of sulfide ion required to just initiate precipitation is  M.

2.Solid nickel(II) nitrate is slowly added to 175 mL of a 0.0655 M sodium sulfide solution. The concentration of nickel ion required to just initiate precipitation is  M.

3.Solid sodium sulfate is slowly added to 175 mL of a 0.0515 M lead nitrate solution. The concentration of sulfate ion required to just initiate precipitation is  M.

Answer 1

. Reaction : (NHa), 5 (aq) + Zn (NO3), (aq) + 2 NHANOZ (aq) + zns (s) Precipitation will start when ksp of ons will be attained bu [Zn2+ ] and [52-]. Here, [2012+] = 0.0663 M Ksp of ens = 1x10 23 X zns Zn2+ +52-} Ksp = [Zn2+).[52] :, 0.0663% [52-] = 1x1623 [52-) = 1X1023 0.0663 :. [52-] = 1.508 x1622 M to ói 1.508 x1022 M 82-concentration is required just initiate the precipitation. Note: questions should be answered in similar All the way.