Sodium bifluoride

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What Wikipedia says

Sodium bifluoride is the inorganic compound with the formula Na[HF2]. It is a salt of sodium cation (Na+) and bifluoride anion ([HF2]−). It is a white, water-soluble solid that decomposes upon heating. Sodium bifluoride is non-flammable, hygroscopic, and has a pungent smell.

Excerpt from the Wikipedia article “Sodium bifluoride”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Leiem, CC BY 4.0, via Wikimedia Commons.