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Glite Dictionary
calcium octadecanoate

calcium octadecanoate

9.2
A hard white deposit that forms when soap meets hard water
  • noun
  • /ˈkæl.si.əm ɒkˌteɪ.dəˈkeɪ.noʊ.eɪt/
  • Specialized
translation icon : octadecanoato de calcio
  • When hard water is used with soap, calcium octadecanoate forms as an insoluble residue.

Examples

  • Chemists analyzed the scum and identified it as calcium octadecanoate.

  • The buildup of calcium octadecanoate in pipes is a common problem in areas with hard water.

  • The chemist analyzed the calcium octadecanoate in the sample.

  • In hard water, calcium octadecanoate can form a scum.

  • The buildup of calcium octadecanoate in pipes is a common problem in areas with hard water.

  • When hard water is used with soap, calcium octadecanoate forms as an insoluble residue.

  • In hard water, calcium octadecanoate can form a scum.

Synonyms

calcium stearate
vscalcium octadecanoate
  • Specialized
5.9

A white powder that does not dissolve in water and helps things move and flow better

is the salt of stearic acid that forms scum when soap meets hard water

Surface Forms

calcium octadecanoate singular
calcium octadecanoates plural

Morphology

calcium + octadecanoate

The term follows regular chemical naming (metal + -ate anion) so its meaning — a calcium salt of octadecanoic/stearic acid — is compositionally predictable to anyone with basic chemistry knowledge. However, the second constituent 'octadecanoate' is technical (and absent from the provided dictionary), and the '-ate' naming convention and acid→salt mapping are unlikely to be known by an average B1 learner, so the expression is only partially transparent.

Etymology

Calcium octadecanoate is named from two parts: calcium, a metal, and octadecanoate, the fat-like part that comes from an 18-carbon acid. When soap meets 'hard water', the calcium joins the fat parts and makes a white 'soap scum' that does not dissolve, so the name explains why it appears as that residue.