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.
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