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In my chemistry lab, I have a vial of Sodium Hydrogen Sulfate (Sodium Bisulfate). I've noticed that when I take a spoonful using a spatula, the spatula gets covered in many tiny droplets, and the lid of the vial always has a layer of tiny droplets on the inside.

Does the Sodium Hydrogen Sulfate (Sodium Bisulfate) react in any way to produce this moisture? Is this to do with the salt being hydrous or anhydrous?

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    $\begingroup$ I guess moisture comes from the air. $\endgroup$ Jun 1, 2020 at 16:15

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Does the Sodium Hydrogen Sulfate (Sodium Bisulfate) react in any way to produce this moisture?

This process is called deliquescence (mouthful word). This process is not specific to your salt, even table salt, NaCl, would do the same in a humid environment e.g. on a rainy day. This has nothing to do with the state of hydrated or anhydrous salt. It is the nature of the compound.

The opposite of this phenomenon is efflorescence. The hydrated salt becomes dry when exposed to air.

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I wouldn't categorize either sodium chloride or sodium bisulfate as deliquescent. If you want to see a good example of a deliquescent compound, put a teaspoon of calcium chloride (ice melt) in a petri dish and leave it out for a day. You'll find a liquid when you return. It dissolved in the water it absorbed from the air. When is the last time your salt shaker shook water? Table salt is nonetheless hygroscopic, thus why my grandmother put rice in the salt shaker as a desiccant. Just saying for the record.

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