1. It is found that the concentration of Pb2+ in a saturated solution of lead(II
ID: 850206 • Letter: 1
Question
1. It is found that the concentration of Pb2+ in a saturated solution of lead(II) fluoride is 3.0 * 10^-3 M. What is Ksp for PbF2?
a. 1.3*19^-9
b. 9.1*10^-3
c. 9.1*10^-6
d. 2.8*10^-8
e. 1.1*10^-7
2. What is the minimum concentration of Cu2+ required to begin precipitating Cu(OH)2(s) in a solution of pH 10.64? For Cu(OH)2, Ksp = 2.6 1019.
a. 2.2*10^-4 M
b. 6.0*10^-16 M
c. 1.1*10^-8 M
d. 2.3*10^-21 M
e. 1.4*10^-12 M
3. Drying agents called desiccants can be based on the cobalt complexes shown as
pink
If this desiccant is moist, then its color will be
a. pinkish blue
b. clear
c. blue
d. pink
e. black
Co(H2O)62+(aq) + 4 Cl(aq) CoCl42(aq) + 6H2O(l) 1. It is found that the concentration of Pb2+ in a saturated solution of lead(II) fluoride is 3.0 * 10^-3 M. What is Ksp for PbF2? a. 1.3*19^-9 b. 9.1*10^-3 c. 9.1*10^-6 d. 2.8*10^-8 e. 1.1*10^-7 2. What is the minimum concentration of Cu2+ required to begin precipitating Cu(OH)2(s) in a solution of pH 10.64? For Cu(OH)2, Ksp = 2.6 ½ 10½19. a. 2.2*10^-4 M b. 6.0*10^-16 M c. 1.1*10^-8 M d. 2.3*10^-21 M e. 1.4*10^-12 M 3. Drying agents called desiccants can be based on the cobalt complexes shown as Co(H2O)62+(aq) + 4 Cl½(aq) q1-1.png CoCl42½(aq) + 6H2O(l) pink clear blue If this desiccant is moist, then its color will be a. pinkish blue b. clear c. blue d. pink e. blackExplanation / Answer
1. Ksp of PbF2:
The dissolved PbF2 will be present in the form of ions so that,
[Pb2+] = [F-]2 = 3.0 * 10-3 M
Ksp = [Pb2+] [F-]2
= (3.0 * 10-3 M) * (2 * 3.0 * 10-3 M)2 = 108 * 10-9 = 1.1 * 10-7
Answer is e) 1.1 * 10-7
2. Use the pH to get the pOH:
14.00 - 10.64 = 3.36
Use the pOH to get the [OH
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.