1. A lab tech adds 0.20 mol of NaF to 1.00 mL OF 0.35 M cadmium nitrate, Cd(NO3)
ID: 523585 • Letter: 1
Question
1. A lab tech adds 0.20 mol of NaF to 1.00 mL OF 0.35 M cadmium nitrate, Cd(NO3)2. Which of the following statements is correct? Ksp=6.44x10^-3 for CdF2.
a. Cadmium fluroide precipitates until the solution is saturated.
b. The solution is unsaturated and no precipitate forms.
c. The solubility of cadmium fluoride is increased by the presence of additional fluoride ions.
d. One must know Ksp for cadimium nitrate to make meaningful predictions on this system.
e. The presence of NaF will raise the solubility of Cd(NO3)2
Explanation / Answer
a)
Get Q
Q = [Cd2+][F-]^2
[F-] = mol/V = (0.2)/(1*10^-3) = 200
Q = (0.35)(200^2) = 14000
clearly, this is greter than Ksp
then
this is super sautrated
a. Cadmium fluroide precipitates until the solution is saturated. ---> TRUE
b. The solution is unsaturated and no precipitate forms. --> Falsel Q > Ksp
c. The solubility of cadmium fluoride is increased by the presence of additional fluoride ions. --> False
d. One must know Ksp for cadimium nitrate to make meaningful predictions on this system. --> False, no need since it is not the equilbirium of interest
e. The presence of NaF will raise the solubility of Cd(NO3)2 --> Not really of interest
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