Chemistry, substance having property of neutralizing acids.

Plurale: alkalis

In chemistry, a compound classed as a base that is soluble in water. Alkalis neutralize acids and are soapy to the touch.
The hydroxides of metals are alkalis: those of sodium (sodium hydroxide, NaOH) and of potassium (potassium hydroxide, KOH) being chemically powerful; both were derived from the ashes of plants.
The four main alkalis are sodium hydroxide (caustic soda, NaOH); potassium hydroxide (caustic potash, KOH); calcium hydroxide (slaked lime or limewater, Ca(OH)2); and aqueous ammonia (NH3 (aq)). Their solutions all contain the hydroxide ion OH-, which gives them a characteristic set of properties.
Alkalis react with acids to form a salt and water (neutralization).
KOH + HNO3 ® KNO3 + H2O
OH- + H+ ® H2O
They give a specific color reaction with indicators; for example, litmus turns blue.
A mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture.

Plurale: alkali grasses

Plant of western North America having grasslike leaves and greenish-white flowers; SYN. Zigadenus elegans.

Plurale: alkali metals

Any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium).
Any of a group of six metallic elements with similar chemical properties: lithium, sodium, potassium, rubidium, cesium, and francium. They form a linked group (Group One) in the periodic table of the elements. They are univalent (have a valence of one) and of very low density (lithium, sodium, and potassium float on water); in general they are reactive, soft, low-melting-point metals. Because of their reactivity they are only found as compounds in nature.

Plurale: alkali poisonings

Poisoning resulting from the ingestion of an alkali compound (as lye or ammonia).

Change into alkali.

Plurale: alkalimeters

Instrument measuring strength or amount of alkali in mixture.
Instrument for measuring strength of alkalines

Plurale: alkalimetries

ETYM Cf. French alcalimètrie.
Measuring the strength of an alkali or amount of alkali in a mixture or solution.

ETYM Cf. French alcalin.
Pertaining to, like or consisting of alkali.
(Chemistry) Relating to or containing an alkali; having a pH greater than 7; SYN. alkalic.

Plurale: alkaline batteries

A long-lived dry cell with an alkaline electrolyte that decreases corrosion of the cell .

Plurale: alkaline cells

Alkaline battery.