Sodium lauryl sulphate $CH _{3}\left( CH _{2}\right)_{10} CH _{2}- OSO _{3}^{\ominus} Na ^{\oplus}$ is an anionic detergent. It is the sodium salt of sulphonated lauryl alcohol, $CH _{3}\left( CH _{2}\right)_{10} CH _{2}- OH$. Sodium stearate is a soap.