Question

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. Thanks

asking:missed:

Charts:

Ksp-

BromidesPbBr₂6.3 × 10^-6

AgBr3.3 × 10^-13CarbonatesBaCO₃8.1 × 10^-9

CaCO₃3.8 × 10^-9

CoCO₃8.0 × 10^-13

CuCO₃2.5 × 10^-10

FeCO₃3.5 × 10^-11

PbCO₃1.5 × 10^-13

MgCO₃4.0 × 10^-5

MnCO₃1.8 × 10^-11

NiCO₃6.6 × 10^-9

Ag₂CO₃8.1 × 10^-12

ZnCO₃1.5 × 10^-11ChloridesPbCl₂1.7 × 10^-5

AgCl1.8 × 10^-10ChromatesBaCrO₄2.0 × 10^-10

CaCrO₄7.1 × 10^-4

PbCrO₄1.8 × 10^-14

Ag₂CrO₄9.0 × 10^-12CyanidesNi(CN)₂3.0 × 10^-23

AgCN1.2 × 10^-16

Zn(CN)₂8.0 × 10^-12FluoridesBaF₂1.7 × 10^-6

CaF₂3.9 × 10^-11

PbF₂3.7 × 10^-8

MgF₂6.4 × 10^-9HydroxidesAgOH2.0 × 10^-8

Al(OH)₃1.9 × 10^-33

Ca(OH)₂7.9 × 10^-6

Cr(OH)₃6.7 × 10^-31

Co(OH)₂2.5 × 10^-16

Cu(OH)₂1.6 × 10^-19

Fe(OH)₂7.9 × 10^-15

Fe(OH)₃6.3 × 10^-38

Pb(OH)₂2.8 × 10^-16

Mg(OH)₂1.5 × 10^-11

Mn(OH)₂4.6 × 10^-14

Ni(OH)₂2.8 × 10^-16

Zn(OH)₂4.5 × 10^-17IodidesPbI₂8.7 × 10^-9

AgI1.5 × 10^-16OxalatesBaC₂O₄1.1 × 10^-7

CaC₂O₄2.3 × 10^-9

MgC₂O₄8.6 × 10^-5PhosphatesAlPO₄1.3 × 10^-20

Ba₃(PO₄)₂1.3 × 10^-29

Ca₃(PO₄)₂1.0 × 10^-25

CrPO₄2.4 × 10^-23

Pb₃(PO₄)₂3.0 × 10^-44

Ag₃PO₄1.3 × 10^-20

Zn₃(PO₄)₂9.1 × 10^-33SulfatesBaSO₄1.1 × 10^-10

CaSO₄2.4 × 10^-5

PbSO₄1.8 × 10^-8

Ag₂SO₄1.7 × 10^-5SulfidesCaS8 × 10^-6

CoS5.9 × 10^-21

CuS7.9 × 10^-37

FeS4.9 × 10^-18

Fe₂S₃1.4 × 10^-88

PbS3.2 × 10^-28

MnS5.1 × 10^-15

NiS3.0 × 10^-21

Ag₂S1.0 × 10^-49

ZnS2.0 × 10^-25SulfitesBaSO₃8.0 × 10^-7

CaSO₃1.3 × 10^-8

Ag₂SO₃1.5 × 10^-14

^Ka&Kb-

Acetic acid	CH3COOH	1.8 × 10-5
Acetylsalicylic acid (aspirin)	HC9H7O4	3.0 × 10-4
Aluminum ion	Al(H2O)43+	1.2 × 10-5
Arsenic acid	H3AsO4	2.5 × 10-4	5.6 × 10-8	3.0 × 10-13
Ascorbic acid	H2C6H6O6	7.9 × 10-5	1.6 × 10-12
Benzoic acid	C6H5COOH	6.3 × 10-5
Carbonic acid	H2CO3	4.2 × 10-7	4.8 × 10-11
Ferric ion	Fe(H2O)63+	4.0 × 10-3
Formic acid	HCOOH	1.8 × 10-4
Hydrocyanic acid	HCN	4.0 × 10-10
Hydrofluoric acid	HF	7.2 × 10-4
Hydrogen peroxide	H2O2	2.4 × 10-12
Hydrosulfuric acid	H2S	1.0 × 10-7	1.0 × 10-19
Hypochlorous acid	HClO	3.5 × 10-8
Nitrous acid	HNO2	4.5 × 10-4
Oxalic acid	H2C2O4	5.9 × 10-2	6.4 × 10-5
Phenol	C6H5OH	1.0 × 10-10
Phosphoric acid	H3PO4	7.5 × 10-3	6.2 × 10-8	3.6 × 10-13
Sulfuric acid	H2SO4	very large	1.2 × 10-2
Sulfurous acid	H2SO3	1.7 × 10-2	6.4 × 10-8
Zinc ion	Zn(H2O)42+	2.5 × 10-10

Base	Formula	Kb
Ammonia	NH3	1.8 × 10-5
Aniline	C6H5NH2	7.4 × 10-10
Caffeine	C8H10N4O2	4.1 × 10-4
Codeine	C18H21O3N	8.9 × 10-7
Diethylamine	(C2H5)2NH	6.9 × 10-4
Dimethylamine	(CH3)2NH	5.9 × 10-4
Ethylamine	C2H5NH2	4.3 × 10-4
Hydroxylamine	NH2OH	9.1 × 10-9
Isoquinoline	C9H7N	2.5 × 10-9
Methylamine	CH3NH2	4.2 × 10-4
Morphine	C17H19O3N	7.4 × 10-7
Piperidine	C5H11N	1.3 × 10-3
Pyridine	C5H5N	1.5 × 10-9
Quinoline	C9H7N	6.3 × 10-10
Triethanolamine	C6H15O3N	5.8 × 10-7
Triethylamine	(C2H5)3N	5.2 × 10-4
Trimethylamine	(CH3)3N	6.3 × 10-5
Urea	N2H4CO	1.5 × 10-14

What is the approximate concentration of free Ar ion at equilibrium when 1.79x10 2 mol aluminum nitrate is added to 1 L of solution that is 1.130 MinF. For [A Kf-6.9x10