A solution contains 6.50 × 10¬º M of calcium ion. A concentrated sodium fluoride solution is added to precipitate calcium fluoride (assume no volume change). a. At what concentration of F¯ does precipitate start to form? K„ for CaF2 is 3.4 x 10-1". |м F] = b. When [F ] = 1.00 × 10-4 M, what is the calcium-ion concentration? What percentage of the calcium ion has precipitated? [Ca*+] = м Percentage =

Consider the common ion effect. The molar solubility of PbBr in a solution that is 0.250 M in NaBr is _____ Ksp (PbBr2) = 4.67 × 10-6. *Be sure to report appropriate amount of sig figs and units.

4. Tap water contains the sulfate ion 50 at about 0.00400 mol/L. If 15 mL of 0.00100 mol/L BaCl, is added to 85 mL of tap water, will a precipitate form? Kup of barium sulfate is 1.1 x 10-¹0 (T/1:6)

Consider a solution that is 0.035 M Ca2+ and 0.068 M Pb2*. When K,SO, is added to the solution, what will be the first precipitate and what minimum concentration of K,SO, is required for this precipitate? Compound Kp CaSO, 7.10 x 10-5 PBSO4 1.82 x 10-8 O Caso, will precipitate fırst when [K,SO,) - 2.68 x 10-7 M. %3D O PbSO, will precipitate first when [K,SOl = 5.20 x 10-7 M. O PBSO, will precipitate first when [K,SO] = 2.68 x 10-7 M. O PbSO, will precipitate first when [K,SO.) - 2.03 x 10-3 M. O CasO, will precipitate first when [K,SO] = 2.03 x 10-3 M. D Question 17 Which of the following statements regarding BCI3 is CORRECT? O BCI, is a Lewis acid because B can donate a pair of electrons. BCI, is a Lewis acid because can accept a pair of electrons. BCI, is a Lewis acid because Cl can accept a pair of electrons. O BCI, is a Lewis base because Cl can donate a pair of electrons. BCI, is a Lewis base because B can donate a pair of electrons.