Magnesium reacts with dilute hydrochloric acid

After magnesium is stored in the air for a certain period of time, a magnesium oxide film will be formed on the surface. When magnesium begins to react with dilute hydrochloric acid, it will first react with magnesium oxide on the surface, and dilute hydrochloric acid can only begin to react with magnesium after magnesium oxide is dissolved.

In the process of magnesium oxide dissolution, the surface area of magnesium exposed to acid increases with the decrease of magnesium oxide surface area, so the hydrogen generation rate increases; As the reaction continues, magnesium decreases and the concentration of dilute hydrochloric acid decreases, so the hydrogen generation rate decreases.

Reaction equation: Mg+2HCl=MgCl? +H？ ↑

Extended data:

chemical property

It has strong reducibility, can react with boiling water to release hydrogen, and can produce dazzling white light when burning. Magnesium does not react with fluoride, hydrofluoric acid and chromic acid, nor is it corroded by caustic alkali, but it is easily soluble in organic and inorganic acids, and magnesium can be directly combined with nitrogen, sulfur and halogen.

Organic chemicals including hydrocarbons, aldehydes, alcohols, phenols, amines, fats and most oils have little or no influence on magnesium. However, it reacts violently with halogenated hydrocarbons under anhydrous conditions (to form Grignard reagent). Magnesium can react with carbon dioxide, so the burning of magnesium cannot be put out with a carbon dioxide fire extinguisher.

Magnesium can react with n? What about o? Reaction, so when magnesium burns in the air, it will burn violently and emit dazzling white light, releasing heat and generating white solids. The change of vinegar is that bubbles come out quickly, float on the surface of vinegar and gradually disappear.

Some fireworks and flares contain magnesium powder, which makes use of the characteristic that magnesium emits dazzling white light when it burns in the air. The valence of magnesium in chemical reactions is usually +2.

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