When you boil a pot of water until it all boils off, what is the whitish, dusty residue that remains on the bottom of the pan?

Question

Is it just minerals/other impurities in the water?

In: Chemistry

Answer 1

Pretty much any dissolved solids. Salts, mostly. As the water boils off, these solids become more and more concentrated in the water until it can no longer hold them all and they precipitate into a solid.