Skin Care and Treatments of Melbourne Dermatology - pH

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pH


pH is a figure expressing the acidity or alkalinity of a skin care solution on a logarithmic scale on which 7 is neutral, lower values are more acid, and higher values more alkaline.

The pH is equal to -log10c, where c is the hydrogen ion concentration in moles per liter.

ORIGIN

Early 20th century.

From p representing the German for power "Potenz" + H, the symbol for hydrogen.

9 August 2005

Litmus

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.’

9 August 2005

Saline

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.

9 August 2005

Carboxyl

Carboxyl means of or denoting the acid radical -COOH, present in most organic acids.

9 August 2005

Base (Basic)

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.

10 August 2005

Alkyl

Meaning of or denoting a hydrocarbon radical derived from an alkane by removal of a hydrogen atom.

10 August 2005

Alkane

Alkanes are any of the series of saturated hydrocarbons including methane, ethane, propane, and higher members.

Alkanes have the general formula: CnH2n+2.

9 August 2005

Hydroxide

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.

10 August 2005

Uric Acid

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.

9 August 2005

Carboxylic (Acid)

Carboxylic acid is an organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid.

9 August 2009

pH-balanced

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