STANDARD SOLUTIONS OF OXIDATION AND REDUCTION REAGENTS

For each reagent listed, the last column of this table gives the mass in grams which is contained in a solution whose amount-of-substance concentration divided by the equivalence factor of the compound equals 0.1 mol/L. The equivalence factor given refers to the most common reactions of the reagent. In the older literature such a solution is often called a “decinormal solution” (0.1 N).
Name Formula Atomic or molecular weight Equivalence factor Mass In Grams
Antimony Sb 121.75 1/2 6.0875
Arsenic As 74.9216 1/2 3.7461
Arsenic trisulfide As2S3 246.0352 1/4 6.1509
Arsenous oxide As2O3 197.8414 1/4 4.9460
Barium peroxide BaO2 169.3388 1/2 8.4669
Barium peroxide hydrate BaO2 · 8H2O 313.4615 1/2 15.6730
Calcium Ca 40.08 1/2 2.004
Calcium carbonate CaCO3 100.0894 1/2 5.0045
Calcium hypochlorite Ca(OCl)2 142.9848 1/4 3.5746
Calcium oxide CaO 56.0794 1/2 2.8040
Chlorine Cl 35.453 1 3.5453
Chromium trioxide CrO3 99.9942 1/3 3.3331
Ferrous ammonium sulfate FeSO4(NH4)SO4 · 6H2O 392.0764 1 39.2076
Hydroferrocyanic acid H4Fe(CN)6 215.9860 1 21.5986
Hydrogen peroxide H2O2 34.0147 1/2 1.7007
Hydrogen sulfide H2S 34.0799 1/2 1.7040
Iodine I 126.9044 1 12.6904
Iron Fe 55.847 1 5.5847
Iron oxide (ferrous) FeO 71.8464 1 7.1846
Iron oxide (ferric) Fe2O3 159.6922 1/2 7.9846
Lead peroxide PbO2 239.1888 1/2 11.9594
Manganese dioxide MnO2 86.9368 1/2 4.3468
Nitric acid HNO3 63.0129 1/3 2.1004
Nitrogen trioxide N2O3 76.0116 1/4 1.9002
Nitrogen pentoxide N2O5 108.0104 1/6 1.8001
Oxalic acid C2H2O4 90.0358 1/2 4.5018
Oxalic acid hydrate C2H2O4 · 2H2O 126.0665 1/2 6.3033
Oxygen O 15.9994 1/2 0.8000
Potassium dichromate K2Cr2O7 294.1918 1/6 4.9032
Potassium chlorate KClO3 122.5532 1/6 2.0425
Potassium chromate K2CrO4 194.1076 1/3 6.4733
Potassium ferrocyanide K4Fe(CN)6 368.3621 1 36.8362
Potassium ferrocyanide hydrate K4Fe(CN)6 · 3H2O 422.4081 1 42.2408
Potassium iodide KI 166.0064 1 16.6006
Potassium nitrate KNO3 101.1069 1/3 3.3702
Potassium perchlorate KClO4 138.5526 1/8 1.7319
Potassium permanganate KMnO4 158.0376 1/5 3.1608
Sodium chlorate NaClO3 106.4410 1/6 1.7740
Sodium nitrate NaNO3 84.9947 1/3 2.8332
Sodium thiosulfate hydrate Na2S2O3 · 5H2O 248.1825 1 24.8183
Stannous chloride SnCl2 189.5960 1/2 9.4798
Stannous oxide SnO 134.6894 1/2 6.7345
Sulfur dioxide SO2 64.0628 1/2 3.2031
Tin Sn 118.69 1/2 5.935