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Solubility Products of Selected Compounds

Solubility Rules:

Greater than 0.1 mole/Liter = Soluble
Between 0.1 and 0.01 mole/Liter = Slightly Soluble
Less than 0.01 mole/Liter = Insoluble

1. All sodium, potassium, and ammonium salts are soluble.
2. All nitrates, acetates and perchlorates are soluble.
3. Most chlorides, bromides and iodides are soluble, except Silver and Mercury.
4. All carbonates, sulfides, oxides and hydroxides are insoluble.
5. All sulfates are soluble except calcium sulfate and barium sulfate.

Compound Formula Ksp
Aluminum Chloride (699g / Liter) AlCl3 20400
Aluminum Hydroxide Al(OH)3 4.6 x 10-33
Aluminum Nitrate (637g / Liter) Al(NO3)3 2160
Aluminum Phosphate AlPO4 6.3 x 10-19
Aluminum Sulfate (313g / Liter) Al2(SO4)3 69.2
Ammonium Carbonate (1000g / Liter) (NH4)2CO3 4520
Ammonium Chloride (395g / Liter) NH4Cl 30.9
Ammonium Chromate (405g / Liter) (NH4)2CrO4 75.7
Ammonium Nitrate (1180g / Liter) NH4NO3 219
Ammonium Phosphate (261g / Liter) (NH4)3PO4 254
Ammonium Sulfate (706g / Liter) (NH4)2SO4 611
Barium Bromide (1040g / Liter) BaBr2 172
Barium Carbonate (0.02g / Liter) BaCO3 1.03 x 10-8
Barium Chromate (.0034g / Liter) BaCrO4 2.2 x 10-10
Barium Fluoride BaF2 1.0 x 10-6
Barium Hydroxide (56g / Liter) Ba(OH)2 5 x 10-3
Barium Iodate Ba(IO3)2 1.5 x 10-9
Barium Iodide (1700g / Liter) BaI2 329
Barium Oxalate BaC2O4 2.3 x 10-8
Barium Sulfate (.0022g / Liter) BaSO4 1.1 x 10-10
Barium Sulfite BaSO3 8 x 10-7
Barium ThioSulfate BaS2O3 1.6 10-5
Bismuthyl Chloride BiOCl 1.8 x 10-31
Bismuthyl Hydroxide BiOOH 4 x 10-10
Bismuth(III) Sulfide Bi2S3 1 x 10-97
Cadmium Hydroxide Cd(OH)2 2.5 x 10-14
Cadmium Iodate Cd(IO3)2 2.3 x 10-8
Cadmium Sulfide CdS 8.0 x 10-27
Calcium Bromide (1420g / Liter) CaBr2 1430
Calcium Carbonate (.014g / Liter) CaCO3 3.8 x 10-9
Calcium Chloride (745g / Liter) CaCl2 1210
Calcium Chromate (163g / Liter) CaCrO4 7.1 x 10-4
Calcium Fluoride CaF2 5.3 x 10-9
Calcium Hydroxide (1.85g / Liter) Ca(OH)2 5.5 x 10-6
Calcium Iodate Ca(IO3)2 7.1 x 10-7
Calcium Iodide (2090g / Liter) CaI2 1440
Calcium Oxalate Hydrate CaC2O4.H2O 1.96 x 10-8
Calcium hydrogen Phosphate CaHPO4 1 x 10-7
Calcium Phosphate (.02g / Liter) Ca3(PO4)2 1 x 10-26
Calcium Sulfate (3.0g / Liter) CaSO4 9.1 x 10-6
Calcium Sulfite CaSO3 6.8 x 10-8
Chromium(II) Hydroxide Cr(OH)2 2 x 10-16
Chromium(III) Hydroxide Cr(OH)3 6.3 x 10-31
Cobalt(II) Carbonate CoCO3 1.4 x 10-13
Cobalt(III) Hydroxide Co(OH)3 1.6 x 10-44
Cobalt(II) Sulfide CoS 4.0 x 10-21
Copper(II) Arsenate Cu3(AsO4)2 7.6 x 10-36
Copper(I) Bromide (.0293g / Liter) CuBr 4.0 x 108
Copper(II) Carbonate CuCO3 1.4 x 10-10
Copper(I) Chloride (.062g / Liter) CuCl 1.2 x 10-6
Copper(II) Chloride (706g / Liter) CuCl2 579
Copper(II) Chromate CuCrO4 3.6 x 10-6
Copper(I) Cyanide CuCN 3.2 x 10-20
Copper(II) FerroCyanide Cu2[Fe(CN)6] 1.3 x 10-16
Copper(II) Hydroxide Cu(OH)2 2.2 x 10-20
Copper(I) Iodide (.08g / Liter) CuI 1.1 x 10-12
Copper(I) Oxide – red, Cuprous Cu2O find out
Copper(II) Oxide – black, Cupric CuO find out
Copper(II) Nitrate (2440g / Liter) Cu3(NO3)2 2440
Copper(I) Sulfide Cu2S 2.5 x 10-48
Copper(II) Sulfide CuS 6 x 10-37
Copper(II) Thiocyanate Cu(SCN)2 4.0 x 10-14
Copper(II) Phosphate Cu3(PO4)2 find out
Fluorapatite Ca5(PO4)3F 1.0 x 10-60
Gold(III) Chloride – 68g/100ml (cold)
 See: Gold Chloride main page		 AuCl3 – HAuCl4 680 grams/Liter (cold)
Hydroxyapatite Ca5(PO4)3OH 1.0 x 10-36
Iron(II) Carbonate FeCO3 3.2 x 10-11
Iron(II) Chloride (644 g/Liter) FeCl2 find out
Iron(II) Hydroxide Fe(OH)2 8.0 x 10-16
Iron(II) Sulfide FeS 6 x 10-19
Iron(III) Arsenate FeAsO4 5.7 x 10-21
Iron(III) FerroCyanide Fe4[Fe(CN)6]3 3.3 x 10-41
Iron(III) Hydroxide Fe(OH)3 4 x 10-38
Iron(III) Phosphate FePO4 1.3 x 10-22
Lead(II) Arsenate Pb3(AsO4)2 4.0 x 10-36
Lead(II) Azide Pb(N3)2 2.5 x 10-9
Lead(II) Bromate Pb(BrO3)2 7.9 x 10-6
Lead(II) Bromide (4.55g / Liter) PbBr2 4.0 x 10-5
Lead(II) Carbonate (.0011g / Liter) PbCO3 7.4 x 10-14
Lead(II) Chloride (10g/Liter)
(33g/Liter @100°C)		 PbCl2 1.6 x 10-5
Lead(II) Chromate (.000058g / Liter) PbCrO4 2.8 x 10-13
Lead(II) Fluoride PbF2 2.7 x 10-8
Lead(II) Hydroxide (.155g / Liter) Pb(OH)2 1.2 x 10-5
Lead(II) Iodate Pb(IO3)2 2.6 x 10-13
Lead(II) Iodide (.44g / Liter) PbI2 7.1 x 10-9
Lead(II) Nitrate (512g / Liter) Pb(NO3)2 5.88
Lead(II) Phosphate (.00014g / Liter) PB3(PO4)2 1.6 x 10-32
Lead(II) Sulfate (.0425g / Liter) PbSO4 1.6 x 10-8
Lead(II) Sulfide (2-12g / Liter) PbS 3 x 10-29
Lithium Bromide (1450g / Liter) LiBr 279
Lithium Carbonate (15.4g / Liter) Li2CO3 2.5 x 10-2
Lithium Chloride (637g / Liter) LiCl 226
Lithium Fluoride LiF 3.8 x 10-3
Lithium Hydroxide (128g / Liter) Li2O 28.6
Lithium Iodide (1650g / Liter) LiI 152
Lithium Nitrate (898g / Liter) LiNO3 170
Lithium Oxide (66.7g / Liter) Li2) 44.5
Lithium Phosphate (.39g / Liter) Li3PO4 3.2 x 10-9
Lithium Sulfate (261g / Liter) Li2SO4 53.5
Magnesium ammonium Phosphate MgNH4PO4 2.5 x 10-13
Magnesium Arsenate Mg3(AsO4)2 2.1 x 10-20
Magnesium Bromide (1020g / Liter) MgBr2
Magnesium Carbonate (.106g / Liter) MgCO3 3.5 x 10-8
Magnesium Chloride (542g / Liter) MgCl2 find out
Magnesium Fluoride MgF2 3.7 x 10-8
Magnesium Hydroxide (.0090g / Liter) Mg(OH)2 1.8 x 10-11
Magnesium Iodide (1480g / Liter) MgI2 603
Magnesium Nitrate (1250g / Liter) Mg(NO3)2 2400
Magnesium Oxalate MgC2O4 7 x 10-7
Magnesium Oxide (.0062g / Liter) MgO 2.37 x 10-8
Magnesium Phosphate Mg3(PO4)2 1 x 10-25
Magnesium Sulfate (260g / Liter) MgSO4 4.67
Manganese(II) Carbonate MnCO3 1.8 x 10-11
Manganese(II) Hydroxide Mn(OH)2 1.9 x 10-9
Manganese(II) Sulfide MnS 2.5 x 10-13
Mercury(I) Bromide (4-5g / Liter) Hg2Br2 5.6 x 10-23
Mercury(I) Carbonate (4.5-5g / Liter) Hg2CO3 9.52 x 10-15
Mercury(I) Chloride (.0020g / Liter) Hg2Cl2 5.0 x 10-13
Mercury(I) Chromate Hg2CrO4 2.0 x 10-9
Mercury(I) Cyanide Hg2(CN)2 5 x 10-40
Mercury(I) Iodide HgI2 4.5 x 10-29
Mercury(I) Sulfate (0.6g / Liter) Hg2SO4 7.4 x 10-7
Mercury(I) Sulfide Hg2S 1.0 x 10-47
Mercury(I) Thiocyanate Hg2(SCN)2 3.0 x 10-20
Mercury(II) Bromide (6.1g / Liter) HgBr2 1.94 x 10-5
Mercury(II) Chloride (6.9g / Liter) HgCl2 6.57 x 10-5
Mercury(II) Iodide (0.1g / Liter) Hg2I2 4.26 x 10-11
Mercury(II) Oxide (0.053g / Liter) HgO 5.99 x 10-8
Mercury(II) Sulfide (3-25g / Liter) HgS 1.6 x 10-52
Mercury(II) Thiocyanate Hg(SCN)2 2.8 x 10-20
Nickel(II) Carbonate NiCO3 6.6 x 10-9
Nickel(II) Hydroxide Ni(OH)2 2.0 x 10-15
Nickel(II) Sulfide ScF3 4.2 x 10-18
Palladium(II) Thiocyanate Pd(SCN)2 4.39 x 10-23
Potassium Bromide (535g / Liter) KBr 20.2
Potassium Carbonate (1120g / Liter) K2CO3 2130
Potassium Chloride (359g / Liter) KCl 21.7
Potassium Chromate (629g / Liter) K2CrO4 136
Potassium Hexachloroplatinate K2PtCl6 7.48 x 10-6
Potassium Hydroxide (1070g / Liter) KOH 364
Potassium Iodide (1280g / Liter) KI 59
Potassium Nitrate (1330g / Liter) KNO3 173
Potassium Phosphate (900g / Liter) K3PO4 8730
Potassium Sulfate (120g / Liter) K2SO4 1.32
Scandium Fluoride ScF3 4.2 x 10-18
Scandium Hydroxide Sc(OH)3 4.2 x 10-18
Silver Arsenate Ag3AsO4 1.0 x 10-22
Silver Acetate (11.1g / Liter) AgC2H3O2 2.0 x 10-3
Silver Azide AgN3 2.0 x 10-8
Silver Benzoate AgC7H5O2 2.5 x 10-5
Silver Bromate (1.6g / Liter) AgBrO3 5.5 x 10-5
Silver Bromide (.000135g / Liter) AgBr 5.3 x 10-13
Silver Carbonate (.033g / Liter)
 See: Silver Carbonate main page		 Ag2CO3 8.1 x 10-12
Silver Chloride
 See: Silver Chloride main page
 See: Solubility of Silver Chloride		 AgCl 1.8 x 10-10
Silver Chromate (.035g / Liter) Ag2CrO4 1.1 x 10-12
Silver Citrate (0.0284g / Liter) C6H8Ag3O7
Silver Cyanide (.0000023g / Liter) AgCN 1.2 x 10-16
Silver Fluoride (1000g / Liter) AgF
Silver Iodate (.44g / Liter) AgIO3 3.0 x 10-8
Silver Iodide (.0000026g / Liter) AgI 8.3 x 10-17
Silver Nitrate (1180g / Liter)
 See: Silver Nitrate main page
 See: Solubility of Silver Nitrate		 AgNO3
Silver Nitrite (4.2g / Liter) AgNO2 6.0 x 10-4
Silver Oxalate Ag2C2O4 3.6 x 10-11
Silver(I) Oxide (.00020g / Liter)
 See: Silver Oxide main page		 Ag2O 3.6 x 10-11
Silver Salicylate (0.96g / Liter) HOC6H4COOAg
Silver Phosphate (.00644 g/Liter) Ag3PO4 8.89 x 10-17
Silver Sulfate (8.3g / Liter) Ag2SO4 1.4 x 10-5
Silver Sulfide (.00014g / Liter)
 See: Silver Sulfide main page		 Ag2S 6 x 10-51
Silver Sulfite AgSO3 1.5 x 10-14
Silver Thiocyanate AgSCN 1.0 x 10-12
Sodium Bicarbonate (6.9g / Liter) NaHCO3 find out
Sodium Bromide (1160g / Liter) NaBr 127
Sodium Carbonate (211g / Liter) NaCO3 1.2
Sodium Chloride (360g / Liter) NaCl 37.3
Sodium Chromate (873g / Liter) Na2CrO4 626
Sodium Formate (970g / Liter) NaOOCH find out
Sodium Hydroxide (420g / Liter) NaOH 110
Sodium Iodide (1840g / Liter) NaI 151
Sodium Phosphate (88g / Liter) Na3PO4 2.24
Sodium Sulfate (195g / Liter) Na2SO4 10.3
Sodium Sulfide (154g / Liter) Na2S 30.7
Strontium Carbonate (.01g / Liter) SrCO3 4.59 x 10-9
Strontium Chloride (538g / Liter) SrCl2 156
Strontium Chromate (1.2g / Liter) SrCrO4 2.2 x 10-5
Strontium Fluoride SrF2 2.5 x 10-9
Strontium Hydroxide (4.1g / Liter) SrOH2 1.5 x 10-4
Strontium Iodide (1650g / Liter) SrI2 454
Strontium Oxalate SrC2O4 4 x 10-7
Strontium Sulfate (0.113g / Liter) SrSO4 3.2 x 10-7
Strontium Sulfite SrSO3 4 x 10-8
Thallium(I) Bromate TlBrO3 1.7 x 10-4
Thallium(I) Bromide TlBr 3.4 x 10-6
Thallium(I) Chloride TlCl 1.7 x 10-4
Thallium(I) Chromate Tl2CrO4 9.8 x 10-15
Thallium(I) Iodate TlIO3 3.1 x 10-6
Thallium(I) Iodide TlI 6.5 x 10-8
Thallium(I) Sulfide Tl2S 6 x 10-22
Thallium(I) Thiocyanate TlSCN 1.6 x 10-4
Thallium(III) Hydroxide Tl(OH)3 6.3 x 10-46
Tin(II) Hydroxide Sn(OH)2 1.4 x 10-28
Tin(II) Sulfide SnS 1 x 10-26
Zinc Bromide (44.7g / Liter) ZnBr2 0.0313
Zinc Chloride (4320g / Liter) ZnCl2 127
Zinc Carbonate (0.01g / Liter) ZnCO3 1.4 x 10-11
Zinc Cyanide Zn(CN)2 3 x 10-16
Zinc Hydroxide Zn(OH)2 1.2 x 10-17
Zinc Iodate Zn(IO3)2 3.9 x 10-6
Zinc Iodide (4.432g / Liter) ZnI2 992
Zinc Nitrate (3270g / Liter) Zn(NO3)2 206
Zinc Oxalate ZnC2O4 2.7 x 10-8
Zinc Oxide (0.016g / Liter) ZnO 3.86 x 10-10
Zinc Phosphate Zn3(PO4)2 9.0 x 10-33
Zinc Sulfate (965g / Liter) ZnSO4 35.7
Zinc Sulfide (1.5-9g / Liter) ZnS 2 x 10-25
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