0
answers
0
watching
312
views
16 Nov 2019
State in words the meaning of the solubility product equation for Pbl_2: K_sp = [PB^2-][I^-]^2 When 5.0 ml of 0.012 M Pb(NO_3)_2 are mixed with 5.0 mL of 0.030M KI, a yellow precipitate of Pbl_2(s) forms. a. How many moles of Pb^2 are initially present? _____ moles a. How many moles of I^- are originally present? _____ moles c. In a colorimeter the equilibrium solution is analyzed for I^-, and its concentration is found to be 7 times 10^-3 mole/liter. How many moles I^- are present in the solution (10 ml)? _____ moles d. How many moles of I^- precipitated? _____ moles e. How many moles of Pb^2+ precipitated? _____ moles f. How many moles of Pb^2+ are left in solution? _____ moles g. What is the concentration of Pb^2+ in the equilibrium solution? h. Find a value for K_sp of Pbl_2 from these data. _____ In another experiment a small sample of pure PbI_2 is shaken with water to produce a saturated solution, as in Test tube 5. a. What must be the relationship between [Pb^2+] and [I^-] in that solution? (see Reaction 1.) b. The concentration of l^- in the saturated solution is found to be 5.0 times 10 M. What is the concentration of Pb^2+ ion? _____M c. Using the results of Part b, calculate a value for K_ sp for PbI_2, (Use Eq. 1.)
State in words the meaning of the solubility product equation for Pbl_2: K_sp = [PB^2-][I^-]^2 When 5.0 ml of 0.012 M Pb(NO_3)_2 are mixed with 5.0 mL of 0.030M KI, a yellow precipitate of Pbl_2(s) forms. a. How many moles of Pb^2 are initially present? _____ moles a. How many moles of I^- are originally present? _____ moles c. In a colorimeter the equilibrium solution is analyzed for I^-, and its concentration is found to be 7 times 10^-3 mole/liter. How many moles I^- are present in the solution (10 ml)? _____ moles d. How many moles of I^- precipitated? _____ moles e. How many moles of Pb^2+ precipitated? _____ moles f. How many moles of Pb^2+ are left in solution? _____ moles g. What is the concentration of Pb^2+ in the equilibrium solution? h. Find a value for K_sp of Pbl_2 from these data. _____ In another experiment a small sample of pure PbI_2 is shaken with water to produce a saturated solution, as in Test tube 5. a. What must be the relationship between [Pb^2+] and [I^-] in that solution? (see Reaction 1.) b. The concentration of l^- in the saturated solution is found to be 5.0 times 10 M. What is the concentration of Pb^2+ ion? _____M c. Using the results of Part b, calculate a value for K_ sp for PbI_2, (Use Eq. 1.)