Ferroin Solution

(14634-91-4)

Tris(1,10-phenanthroline)iron(ii) sulfate complex prepared in the following manner. Dissolve 0.7 g of iron(ii) sulfate and 1.76 g of phenanthroline hydrochloride in 70 mL of water and add sufficient water to produce 100 mL.

Complies with the following test.

Sensitivity to cerium(iv) Add 0.1 mL of the solution and 0.15 mL of osmium tetroxide solution to 50 mL of 1m sulfuric acid. Add 0.1 mL of 0.1m ammonium cerium(iv) nitrate. The colour changes from red to light blue.