alkali /ˈalkəlʌɪ/

a

I. noun

1. a compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda.

flint is not subject to chemical weathering except by strong alkalis.
[ mass noun]
the reaction is followed by measuring the concentration of alkali at various times.
Often contrasted with acid and base1.
2. [as modifier]
(chiefly N. Amer.) alkaline.
Alkalis release hydroxide ions (OH) when dissolved in water. Any solution with a pH of more than 7 is alkaline.
– origin late Middle English (denoting a saline substance derived from the ashes of various plants, including glasswort): from medieval Latin, from Arabic al-qalī ‘calcined ashes (of the glasswort etc.)’, from qalā ‘fry, roast’.

Add Comment

By Oxford

Oxford

Get in touch

Quickly communicate covalent niche markets for maintainable sources. Collaboratively harness resource sucking experiences whereas cost effective meta-services.