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Selective Precipitation

Q. A solution contains 0.12M Ba 2+ and 0.18M Ca 2+. Sodium chromate solution is added drop by drop to slowly raise the [CrO4 2-] in the solution. a) What is the first precipitate to form? And at what [CrO4 2-] does that happen? b) If [CrO4 2-] is raised to 3.5 x 10^-3 what percentage of the original Ca 2+ will still be in solution and what percentage of the original Ba 2+ will still be in solution?

Solved • Apr 22, 2020

Selective Precipitation

Q. What is meant by the term “selective precipitation” and how is this technique used to separate and identify specific cations in a solution where several cations are present?

Solved • Apr 21, 2020

Selective Precipitation

Q. 500 mL of 0.02 M MgCl2 is added to 500 mL of KOH at a pH= 11 a. Determine the Qsp. b. Compare it to the Ksp. c. Determine if a precipitate will occur and explain why. Why:

Solved • Apr 14, 2020

Selective Precipitation

Q. Solid Pb(NO3)2 is added to a solution that contains CO3^2- anions. Which best describes the condition when PbCO3 precipitates out of the solution? Ksp of PbCO3 is 7.4 × 10^−14.

Solved • Apr 6, 2020

Selective Precipitation

Q. When 7.5×10^-4 g of KOH is dissolved in 1.00 L of 1.0×10^-10 M Cu(NO3)2, a precipitate of Cu(OH)2 is formed. True or False? (Ksp of Cu(OH)2 is 2.2×10^-20)

Solved • Mar 29, 2020

Selective Precipitation

Q. The Ksp of CaF2 at 25°C 5s 4×1/^-11. Consider a solution that is 1.0×10^-3 M Ca(NO3)2 and 1.0×10^-4 M NaF.

Solved • Mar 29, 2020

Selective Precipitation

Q. The Ksp of CaF2 at 25°C is 4×10^-11. Consider a solution that is 1.0×10^-1 M Ca(NO3)2 and 1.0×10^-5 M NaF.

Solved • Mar 29, 2020