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Boiling hard tap water precipitates dissolved calcium minerals onto heating elements. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Mondo Knows Facts

Hard water leaves white calcium carbonate scale inside kettles

Boiling hard tap water precipitates dissolved calcium minerals onto heating elements

Tap water in hard water areas contains dissolved calcium and magnesium bicarbonate minerals. Heating water inside electric kettles decomposes soluble bicarbonates into insoluble calcium carbonate, which precipitates out of solution to form a chalky white mineral crust on heating elements.

Where this comes from

NIST

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Tags: kettles, water, chemistry

Hard water leaves white calcium carbonate scale inside kettles: the short answers

Where does this come from, and can I check it?: Boiling hard tap water precipitates dissolved calcium minerals onto heating elements. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a everyday life fact?: Yes. It sits on the Everyday Life shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.