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Priya Cherian1, Wilma F Bergfeld2, Donald V Belsito2

  • 1Cosmetic Ingredient Review Senior Scientific Analyst/Writer.

International Journal of Toxicology
|April 23, 2024
PubMed

Keywords:
Cosmetic Ingredient ReviewCosmeticsExpert Panel for Cosmetic Ingredient SafetyLaneth-10Laneth-9Safety

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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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