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元素の種類は不変である。
出る炭粉の少量の酸化銅粉-----------希硫酸、酸化銅は硫酸と反応し、木炭粉末は反応しない 硫酸鉄の製造: 酸化鉄と希硫酸反応:Fe2O3+3H2SO4==Fe2(SO4)3+3H2O
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