- KNO3KNO _{3}
- Ca(H2PO4)2,CaSO4Ca \left( H _{2} PO _{4}\right)_{2}, CaSO _{4}
- (NH2)2CO\left( NH _{2}\right)_{2} CO
- Ca(H2PO4)2Ca \left( H _{2} PO _{4}\right)_{2}