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The most common constituents that make water hard are magnesium and calcium ions, since these form only very slightly soluble salts with anions in soap. The other alkaline earth metal cations have the same effect, but occur less commonly.

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12y ago
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9y ago

Iron is the substance most likely found in hard water. A type of salt can be used to help control the feel and taste of iron in water.

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12y ago

Chalk is one but there are many :D

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11y ago

CaCO3

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Q: What substance is likely found in hard water?
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