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the claim

The white substance left after boiling water is composed of precipitated mineral salts such as calcium carbonate and magnesium sulfate

the verdict

COMMON KNOWLEDGE

no citation needed for this one

refutedsupported

the weight of evidence

no sources on either side

The composition of kettle scale or boiler residue resulting from hard water evaporation is a matter of everyday observation and basic chemistry, requiring no citation.

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The analysis

The claim describes the chemical identity of boiling water scale (limescale/mineral deposits), which is a matter of fundamental inorganic chemistry and common observation. Papers discussing scale formation confirm the presence of calcium and magnesium salts like calcium carbonate, but formal citation is unnecessary for such basic scientific facts.

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first checked04 Aug 2026

judged → COMMON KNOWLEDGE · 9504 Aug 2026

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