Complex equilibria: simultaneous solubility and selective precipitation

36 questions on Complex equilibria: simultaneous solubility and selective precipitation from the Ionic Equilibrium II chapter: 7 NEET level, 14 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

• Dilute AgNO3 solution is added dropwise to a solution containing 0.01 M each of Cl- and Br-. Given K_sp(AgCl) = 1.8 x 10^-10 and K_sp(AgBr) = 5.0 x 10^-13. Whic... NEET level
• 100 mL of 2.0 x 10^-5 M AgNO3 is mixed with 100 mL of 2.0 x 10^-5 M NaCl. Given K_sp(AgCl) = 1.8 x 10^-10, what happens? NEET level
• AgNO3 is added gradually to a solution that is 0.020 M in Cl- (no volume change). With K_sp(AgCl) = 1.8 x 10^-10, at what [Ag+] does AgCl just begin to precipit... NEET level
• Using K_sp(AgCl) = 1.8 x 10^-10, the solubility of AgCl in 0.050 M NaCl (in mol L^-1) is about NEET level
• A solution is 0.010 M in both Cl- and CrO4^2-. Solid AgNO3 is added slowly without change in volume. K_sp(AgCl) = 1.8 x 10^-10, K_sp(Ag2CrO4) = 1.1 x 10^-12. Wh... JEE Main level
• Solid BaSO4 and solid SrSO4 are both present in contact with pure water. K_sp(BaSO4) = 1.0 x 10^-10, K_sp(SrSO4) = 3.2 x 10^-7. Find [Ba^2+] in the saturated so... JEE Main level
• A solution contains 0.10 M each of Cl- and I-. AgNO3 is added until AgCl just starts to precipitate (volume change negligible). With K_sp(AgCl) = 1.8 x 10^-10 a... JEE Main level
• A solution is 0.050 M in both Cl- and Br-. AgNO3 is added until AgCl just begins to precipitate (no volume change). Given K_sp(AgCl) = 1.8 x 10^-10 and K_sp(AgB... JEE Main level
• Solid AgCl and solid AgSCN are in equilibrium with pure water. K_sp(AgCl) = 1.8 x 10^-10, K_sp(AgSCN) = 2.0 x 10^-12. Find [Ag+] in units of 10^-5 M (two decima... JEE Main level
• A solution contains 0.010 M each of Cl-, Br- and I-. Solid AgNO3 is added slowly (no volume change). K_sp: AgCl 1.8 x 10^-10, AgBr 5.0 x 10^-13, AgI 8.5 x 10^-1... JEE Main level
• A solution contains 0.10 M each of Fe^3+ and Mg^2+. Dilute NaOH is added slowly (no volume change). K_sp(Fe(OH)3) = 1.0 x 10^-38, K_sp(Mg(OH)2) = 1.0 x 10^-11, ... JEE Main level
• A solution is 0.10 M in Cl- and 1.0 x 10^-3 M in CrO4^2-. Solid AgNO3 is added slowly (no volume change). K_sp(AgCl) = 1.8 x 10^-10, K_sp(Ag2CrO4) = 1.1 x 10^-1... JEE Advanced level
• 50 mL of 0.20 M Ba(NO3)2 is mixed with 50 mL of 0.20 M Sr(NO3)2. Solid K2CrO4 is then added slowly (negligible volume change). K_sp(BaCrO4) = 1.2 x 10^-10, K_sp... JEE Advanced level
• A solution is 0.010 M in each of Zn^2+ and Cu^2+ and is kept saturated with H2S ([H2S] = 0.10 M). For H2S, K = ([H+]^2[S^2-])/([H2S]) = 1.0 x 10^-21. Given K_sp... JEE Advanced level
• Solid AgCl and solid Ag2CrO4 are both in equilibrium with pure water. K_sp(AgCl) = 1.8 x 10^-10, K_sp(Ag2CrO4) = 1.4 x 10^-12. Find [Ag+] in units of 10^-4 M (t... JEE Advanced level
• A solution contains Fe^3+ and 0.30 M Mg^2+. NaOH is added slowly. Take Fe^3+ as completely removed when its concentration falls to 1.0 x 10^-6 M. With K_sp(Fe(O... JEE Advanced level
• A solution contains 0.010 M each of Br- and CrO4^2-. Solid AgNO3 is added slowly (no volume change). K_sp(AgBr) = 5.0 x 10^-13, K_sp(Ag2CrO4) = 1.1 x 10^-12. Se... JEE Advanced level
• Solid CaF2 and solid SrF2 are both in equilibrium with pure water. K_sp(CaF2) = 3.9 x 10^-11, K_sp(SrF2) = 2.9 x 10^-9. Ignore hydrolysis of F-. Select the corr... JEE Advanced level
• K_sp of AgCl is 1.0x10^-10. Its solubility in 0.1 M NaCl solution is NEET level
• Dilute AgNO3 is added slowly to a solution that is 0.1 M in each of Cl-, Br- and I-. Given K_sp: AgCl = 1.8x10^-10, AgBr = 5.0x10^-13, AgI = 8.5x10^-17. The fir... NEET level
• Solid AgCl dissolves in aqueous ammonia mainly because NEET level
• A solution is saturated with both AgCl (K_sp = 1.6x10^-10) and AgBr (K_sp = 5.0x10^-13) in pure water. Find [Ag+] in units of 10^-5 M (two decimals). JEE Main level
• A solution contains 0.010 M Cl- and 0.010 M CrO4^2-. Solid AgNO3 is added without volume change. Given K_sp(AgCl) = 1.6x10^-10 and K_sp(Ag2CrO4) = 1.9x10^-12, t... JEE Main level
• K_sp of Mg(OH)2 is 4.0x10^-12. At what pH (two decimals) does Mg(OH)2 just begin to precipitate from 0.010 M Mg^2+? Use log 2 = 0.301 and K_w = 10^-14. JEE Main level
• Equal volumes of BaCl2 and Na2SO4 solutions are mixed (K_sp of BaSO4 = 1.1x10^-10). In which of the following pairs of initial concentrations will BaSO4 precipi... JEE Main level
• K_sp of AgCl is 1.6x10^-10. The ratio (solubility in pure water) / (solubility in 0.10 M NaCl) is closest to JEE Main level
• Solid AgNO3 is added to a solution containing 0.010 M Cl- and 0.010 M Br-. K_sp(AgCl) = 1.6x10^-10, K_sp(AgBr) = 5.0x10^-13. When AgCl just begins to precipitat... JEE Main level
• AgCl dissolves in ammonia: AgCl(s) + 2NH3 <=> [Ag(NH3)2]+ + Cl-. Given K_sp = 1.6x10^-10 and K_f([Ag(NH3)2]^+) = 1.6x10^7, and taking the equilibrium (free) [NH... JEE Main level
• A solution is 0.010 M in Mn^2+ and is saturated with H2S ([H2S] = 0.10 M, K_a1K_a2 = 1.0x10^-21). K_sp(MnS) = 2.5x10^-13. Find the pH (two decimals) above which... JEE Advanced level
• 0.10 M aqueous ammonia (initial concentration) is shaken with excess AgCl. K_sp(AgCl) = 1.6x10^-10, K_f([Ag(NH3)2]^+) = 1.6x10^7. Allowing for the ammonia consu... JEE Advanced level
• 0.010 M AgNO3 is dissolved in 1.0 M aqueous NH3 (both are final concentrations before complexation; no volume change). Assume essentially all Ag+ becomes [Ag(NH... JEE Advanced level
• AgX(s) + 2NH3 <=> [Ag(NH3)2]+ + X-. Given K_f([Ag(NH3)2]^+) = 1.6x10^7; K_sp: AgCl = 1.6x10^-10, AgBr = 5.0x10^-13, AgI = 8.5x10^-17. Treat the free [NH3] as co... JEE Advanced level
• Solid AgCl (K_sp = 1.6x10^-10) and solid Ag2CrO4 (K_sp = 1.9x10^-12) are both in equilibrium with pure water. Neglecting hydrolysis of CrO4^2-, the concentratio... JEE Advanced level
• Solid AgNO3 is added to a solution that is 0.10 M in Cl- and 1.0x10^-3 M in I-. K_sp(AgCl) = 1.6x10^-10, K_sp(AgI) = 8.5x10^-17. At the moment AgCl just starts ... JEE Advanced level
• A solution is 0.10 M in Fe^3+ and 0.10 M in Mg^2+. K_sp(Fe(OH)3) = 1.0x10^-38 and K_sp(Mg(OH)2) = 4.0x10^-12; log 2 = 0.301. Alkali is added without volume chan... JEE Advanced level
• Zinc hydroxide dissolves as Zn^2+ (with K_sp = 3.0x10^-17) and, in strong base, as zincate: Zn(OH)2(s) + 2OH- <=> [Zn(OH)4]^2- with K = 1.2x10^-2. The total dis... JEE Advanced level