太陽炉を利用したカーバイドの合成とその教材化

抄録

We investigated the synthesis of calcium carbide (CaC₂) by the reaction of calcium oxide and several carbon materials (graphite, coke, Binchotan（high-grade charcoal produced from ubame oak, i.e. Quercus phillyraeoides）, and ordinary charcoal) using a solar furnace, and found that Binchotan was a suitable carbon source for a student experiment of CaC₂ synthesis. In student experiments, the formation of CaC₂ in the product was confirmed by the reaction of water to evolve acetylene gas, and the amount of CaC₂ was estimated from the volume of acetylene generated. Through trial lesson practices for third-year high school students in chemistry class, they understood the preparation and properties of CaC₂, and deepened their interest in the use of solar energy as well as the history of organic industrial chemistry about acetylene.