Asked by HELP PLEASE to DrBob222
Suppose that a 15-mL sample of a solution is to be tested for I- ion by addition of 1 drop (0.20 mL) of 0.30 M Pb(NO3)2. What is the minimum number of grams of I- that must be present for PbI2(s) to form? (Ksp = 7.9 10-9)
Answers
Answered by
DrBob222
PbI2 ==> Pb^2+ + 2I^-
Ksp = (Pb^2+)(I^-)^2
0.2mL is a big drop but the concn Pb^2+ in the 15 mL sample will be 0.3M x 0.2/15 = ?
Substitute Ksp, ? for Pb^2+, and solve for (I^-) in moles/L.
Convert to moles in 15 mL, then to grams. g = mols x molar mass.
Ksp = (Pb^2+)(I^-)^2
0.2mL is a big drop but the concn Pb^2+ in the 15 mL sample will be 0.3M x 0.2/15 = ?
Substitute Ksp, ? for Pb^2+, and solve for (I^-) in moles/L.
Convert to moles in 15 mL, then to grams. g = mols x molar mass.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.