K-k2O-KOH-K3PO4-KNO3-KOH
2K+ 2H2O= 2KOH+H2 4K+O2=2 K2O K2O+2HNO3= 2KNO3+H2O K2O+H2O= 2KOH 3KOH+H3PO4= K3PO4+ 3H2O