Calcium stearate: Difference between revisions
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'''Calcium stearate''' is a [[carboxylate]] salt of [[calcium]], classified as a calcium [[soap]]. The salt is a component of some [[lubricant]]s, [[surfactant]]s, as well as many foodstuffs. It is a white waxy powder. | '''Calcium stearate''' is a [[carboxylate]] salt of [[calcium]], classified as a calcium [[soap]]. The salt is a component of some [[lubricant]]s, [[surfactant]]s, as well as many foodstuffs. It is a white waxy powder. | ||
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==Production and occurrence== | ==Production and occurrence== | ||
Calcium stearate is produced by heating [[stearic acid]] and [[calcium oxide]]: | Calcium stearate is produced by heating [[stearic acid]] and [[calcium oxide]]: | ||
:2 C<sub>17</sub>H<sub>35</sub>COOH + CaO → (C<sub>17</sub>H<sub>35</sub>COO)<sub>2</sub>Ca + H<sub>2</sub>O | :2 C<sub>17</sub>H<sub>35</sub>COOH + CaO → (C<sub>17</sub>H<sub>35</sub>COO)<sub>2</sub>Ca + H<sub>2</sub>O | ||
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It is also the main component of [[soap scum]], a white solid that forms when soap is mixed with [[hard water]]. Unlike soaps containing sodium and potassium, calcium stearate is insoluble in water and does not lather well. | It is also the main component of [[soap scum]], a white solid that forms when soap is mixed with [[hard water]]. Unlike soaps containing sodium and potassium, calcium stearate is insoluble in water and does not lather well. | ||
Commercially it is sold as a 50% dispersion in water or as a spray dried powder. As a [[food additive]] it is known by the generic [[E number]] E470. | Commercially it is sold as a 50% dispersion in water or as a spray dried powder. As a [[food additive]] it is known by the generic [[E number]] E470. | ||
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==Applications== | ==Applications== | ||
Calcium stearate is a waxy material with low solubility in water, unlike traditional sodium and potassium soaps. It is also easy and cheap to produce, and exhibits low toxicity. These attributes are the basis of many of its applications. Related applications exist for the magnesium stearate. | Calcium stearate is a waxy material with low solubility in water, unlike traditional sodium and potassium soaps. It is also easy and cheap to produce, and exhibits low toxicity. These attributes are the basis of many of its applications. Related applications exist for the magnesium stearate. | ||
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{{Calcium compounds}} | {{Calcium compounds}} | ||
{{Stearates}} | {{Stearates}} | ||
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{{二次利用|date=8 March 2023}} | {{二次利用|date=8 March 2023}} | ||
[[Category:Calcium compounds]] | [[Category:Calcium compounds]] | ||