4K2MoO4 + 32KCN + 25HCl + K[BH4] → 4K4[Mo(CN)8] + H3BO3 + 25KCl + 13H2O
Potassium molybdate react with potassium cyanide, hydrogen chloride and potassium tetrahydroborate to produce oktacyanomolybdate(IV) potassium, boric acid, potassium chloride and water. Hydrogen chloride - diluted solution.