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Please answer the teacher: there is in the packaging bag of a food

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[discussion and analysis] iron can react with oxygen and water in the air at room temperature to form rust, so as to remove oxygen and water
[experimental exploration] (1) the gray black powder contains iron powder
(2) dilute sulfuric acid or dilute hydrochloric acid
(3) the powder is partially dissolved to form a yellow solution
[extended exploration] iron oxide is reduced to lose oxygen, and the carbon powder participates in the reaction (or the mass of solid reduction is the mass of oxygen element in iron oxide and the mass of carbon powder participating in the reaction)

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