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Selective Ion Precipitation Selective ion precipitation can be used to separate cations that form insoluble complexes with almost any ion as long as the difference in Ksp values is at least 3 powers of 10. We have seen how this works for sulfide precipitates, but this can work for almost any ion. The next problem explores the separation of metal hydroxides You are given a solution that is 0.078 in Fe2+ and 0.074 in Mn2+ that you wish to separate using selective ion precipitation with OH ions. The Ksp value for Fe(OH)2 4.87 X10-17 and the Ksp value for Mn(OH)2 = 2.0 X 10-13. a) Which of the two metal hydroxides should you use to set the pH threshold for the separation? o Mn(OH)2 o Fe(OH)2 b) What is the threshold pH, below which you get precipitation of the least soluble metal hydroxide while the most soluble one remains in solution? c) Assume you are at the pH threshold that you calculated in part b. What is the molar concentration of Fe2+ cation that remains in solution at this pH?
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Related questions
I've noticed that recently most of my chemistry questions that get answered have also been incorrect. I cant help but feel like this is a discrepncy between either the methods used, or the values of the refreances when choosing Ka,Ksp,Kb, costants of the nature. In order to avoid this I will post 2 pictures. The fisrt one will be the question I am asking, and the second one will be a worked question of similar nature that I missed. I will also post the refrences that I am using. Please use the numbers off those refernces or the answer will be wrong. Thank
Asking:
Missing:
Charts:
Ksp-
BromidesPbBr26.3 Ã 10-6
AgBr3.3 Ã 10-13CarbonatesBaCO38.1 Ã 10-9
CaCO33.8 Ã 10-9
CoCO38.0 Ã 10-13
CuCO32.5 Ã 10-10
FeCO33.5 Ã 10-11
PbCO31.5 Ã 10-13
MgCO34.0 Ã 10-5
MnCO31.8 Ã 10-11
NiCO36.6 Ã 10-9
Ag2CO38.1 Ã 10-12
ZnCO31.5 Ã 10-11ChloridesPbCl21.7 Ã 10-5
AgCl1.8 Ã 10-10ChromatesBaCrO42.0 Ã 10-10
CaCrO47.1 Ã 10-4
PbCrO41.8 Ã 10-14
Ag2CrO49.0 Ã 10-12CyanidesNi(CN)23.0 Ã 10-23
AgCN1.2 Ã 10-16
Zn(CN)28.0 Ã 10-12FluoridesBaF21.7 Ã 10-6
CaF23.9 Ã 10-11
PbF23.7 Ã 10-8
MgF26.4 Ã 10-9HydroxidesAgOH2.0 Ã 10-8
Al(OH)31.9 Ã 10-33
Ca(OH)27.9 Ã 10-6
Cr(OH)36.7 Ã 10-31
Co(OH)22.5 Ã 10-16
Cu(OH)21.6 Ã 10-19
Fe(OH)27.9 Ã 10-15
Fe(OH)36.3 Ã 10-38
Pb(OH)22.8 Ã 10-16
Mg(OH)21.5 Ã 10-11
Mn(OH)24.6 Ã 10-14
Ni(OH)22.8 Ã 10-16
Zn(OH)24.5 Ã 10-17IodidesPbI28.7 Ã 10-9
AgI1.5 Ã 10-16OxalatesBaC2O41.1 Ã 10-7
CaC2O42.3 Ã 10-9
MgC2O48.6 Ã 10-5PhosphatesAlPO41.3 Ã 10-20
Ba3(PO4)21.3 Ã 10-29
Ca3(PO4)21.0 Ã 10-25
CrPO42.4 Ã 10-23
Pb3(PO4)23.0 Ã 10-44
Ag3PO41.3 Ã 10-20
Zn3(PO4)29.1 Ã 10-33SulfatesBaSO41.1 Ã 10-10
CaSO42.4 Ã 10-5
PbSO41.8 Ã 10-8
Ag2SO41.7 Ã 10-5SulfidesCaS8 Ã 10-6
CoS5.9 Ã 10-21
CuS7.9 Ã 10-37
FeS4.9 Ã 10-18
Fe2S31.4 Ã 10-88
PbS3.2 Ã 10-28
MnS5.1 Ã 10-15
NiS3.0 Ã 10-21
Ag2S1.0 Ã 10-49
ZnS2.0 Ã 10-25SulfitesBaSO38.0 Ã 10-7
CaSO31.3 Ã 10-8
Ag2SO31.5 Ã 10-14
Ka&Kb-
Acetic acid | CH3COOH | 1.8 Ã 10-5 | ||
Acetylsalicylic acid (aspirin) | HC9H7O4 | 3.0 Ã 10-4 | ||
Aluminum ion | Al(H2O)43+ | 1.2 Ã 10-5 | ||
Arsenic acid | H3AsO4 | 2.5 Ã 10-4 | 5.6 Ã 10-8 | 3.0 Ã 10-13 |
Ascorbic acid | H2C6H6O6 | 7.9 Ã 10-5 | 1.6 Ã 10-12 | |
Benzoic acid | C6H5COOH | 6.3 Ã 10-5 | ||
Carbonic acid | H2CO3 | 4.2 Ã 10-7 | 4.8 Ã 10-11 | |
Ferric ion | Fe(H2O)63+ | 4.0 Ã 10-3 | ||
Formic acid | HCOOH | 1.8 Ã 10-4 | ||
Hydrocyanic acid | HCN | 4.0 Ã 10-10 | ||
Hydrofluoric acid | HF | 7.2 Ã 10-4 | ||
Hydrogen peroxide | H2O2 | 2.4 Ã 10-12 | ||
Hydrosulfuric acid | H2S | 1.0 Ã 10-7 | 1.0 Ã 10-19 | |
Hypochlorous acid | HClO | 3.5 Ã 10-8 | ||
Nitrous acid | HNO2 | 4.5 Ã 10-4 | ||
Oxalic acid | H2C2O4 | 5.9 Ã 10-2 | 6.4 Ã 10-5 | |
Phenol | C6H5OH | 1.0 Ã 10-10 | ||
Phosphoric acid | H3PO4 | 7.5 Ã 10-3 | 6.2 Ã 10-8 | 3.6 Ã 10-13 |
Sulfuric acid | H2SO4 | very large | 1.2 Ã 10-2 | |
Sulfurous acid | H2SO3 | 1.7 Ã 10-2 | 6.4 Ã 10-8 | |
Zinc ion | Zn(H2O)42+ | 2.5 Ã 10-10 |
Base | Formula | Kb | ||
---|---|---|---|---|
Ammonia | NH3 | 1.8 Ã 10-5 | ||
Aniline | C6H5NH2 | 7.4 Ã 10-10 | ||
Caffeine | C8H10N4O2 | 4.1 Ã 10-4 | ||
Codeine | C18H21O3N | 8.9 Ã 10-7 | ||
Diethylamine | (C2H5)2NH | 6.9 Ã 10-4 | ||
Dimethylamine | (CH3)2NH | 5.9 Ã 10-4 | ||
Ethylamine | C2H5NH2 | 4.3 Ã 10-4 | ||
Hydroxylamine | NH2OH | 9.1 Ã 10-9 | ||
Isoquinoline | C9H7N | 2.5 Ã 10-9 | ||
Methylamine | CH3NH2 | 4.2 Ã 10-4 | ||
Morphine | C17H19O3N | 7.4 Ã 10-7 | ||
Piperidine | C5H11N | 1.3 Ã 10-3 | ||
Pyridine | C5H5N | 1.5 Ã 10-9 | ||
Quinoline | C9H7N | 6.3 Ã 10-10 | ||
Triethanolamine | C6H15O3N | 5.8 Ã 10-7 | ||
Triethylamine | (C2H5)3N | 5.2 Ã 10-4 | ||
Trimethylamine | (CH3)3N | 6.3 Ã 10-5 | ||
Urea | N2H4CO | 1.5 Ã 10-14 |