Potassium Tungstocyanide, K4[W(CN)8].2H2O, may be prepared by the action of potassium carbonate on the cadmium salt, or by treating a solution of potassium tungsten chloride, K3W2Cl9, with potassium cyanide. It yields light yellow microscopic prisms, which lose all their water at 115° C. According to Olsson, 10 c.c. of water dissolve 13 to 14 grams of the salt at 18° C. The electrical conductivities of solutions containing one equivalent in v litres at 25° C. have been determined as follows
| v = | 32 | 64 | 128 | 256 | 512 | 1024 | | Λ = | 118.8 | 130.0 | 140.6 | 149.5 | 159.8 | 165.8 | |