Tuesday, 9 August 2005
Litmus is a dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.
ORIGIN
Middle English.
From Old Norse lit-mosi, from litr ‘dye’ + mosi ‘moss.’
Tuesday, 9 August 2005
Used as an adjective, saline means containing or impregnated with salt(s).
Used as a noun, saline is a solution of a salt in water.
Saline is chiefly a medical term that describes a solution containing sodium chloride and/or a salt or salts of magnesium or another alkali metal.
Tuesday, 9 August 2005
Carboxyl means of or denoting the acid radical -COOH, present in most organic acids.
Tuesday, 9 August 2005
In skin care chemistry and formulation, base refers to an ingredient with a pH greater than 7, however it may also mean any substance that contains a base as one of its elements.
Often contrasted with acid or acidic.
Compare with alkaline.
Wednesday, 10 August 2005
Meaning of or denoting a hydrocarbon radical derived from an alkane by removal of a hydrogen atom.
Wednesday, 10 August 2005
Alkanes are any of the series of saturated hydrocarbons including methane, ethane, propane, and higher members.
Alkanes have the general formula: CnH2n+2.
Tuesday, 9 August 2005
A noun used in chemisty, a hydroxide is a compound of a metal with the hydroxide ion OH- (as in many alkalis) or the group -OH.
Wednesday, 10 August 2005
Uric acid is an almost insoluble compound which is a breakdown product of nitrogenous metabolism.
It is the main excretory product in birds, reptiles, and insects.
Uric acid is a bicyclic acid derived from purine with a chemical formula of C 5 H 4 N 4 O 3.
ORIGIN
Early 19th century.
Uric from the French urique, from urine.
Tuesday, 9 August 2005
Carboxylic acid is an organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid.
Sunday, 9 August 2009