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salt03 Zinc salts of hydrochloric acid and other hydrogen halides

Left: Fluorine hydrogen acid (HF) cannot be kept in a glass vial like hydrochloric acid (HCl) and hydrobromic acid (HBr): HF corrodes glass.
Middle: The three acids react with zinc: Gas bubbles (H₂) and salt solutions are formed.
Right: Clear solutions are heated until white dry salts remain: ZnF₂, ZnCl₂, ZnBr₂.  Only zinc fluoride forms crystals without heating, the others are very hygroscopic.