Last summer, I had a memorable trip to an ethnic village in the mountains. The journey was long, but the fresh air and beautiful scenery made it worthwhile. When I arrived, I was warmly welcomed by the local people. They showed me their traditional houses, colorful clothes, and unique customs. I also enjoyed delicious local food and watched a traditional dance performance in the evening. This trip helped me understand more about their culture and simple way of life. I will never forget this meaningful experience.

4P+5O2→2P₂O₅

P2O5 +3H2O → 2H3PO4

2H3PO4 + 3Na2O → 2Na3PO4 + 3H2O

2Na3PO4 + 3CaCl2 → 6NaCl + Ca₃(PO₄)₂