pH Scale
A logarithmic scale measuring the acidity or alkalinity of a solution from 0 to 14.
Also: acidity scale
Definition
The pH scale is a logarithmic measure of the concentration of hydrogen ions (H+) in a solution, ranging from 0 (most acidic) to 14 (most basic/alkaline), with 7 being neutral. Each unit change on the scale represents a tenfold change in hydrogen ion concentration. pH is critical in chemistry, biology, medicine, and environmental science for characterizing solutions and controlling reactions.
Example
“Lemon juice has a pH of about 2, indicating high acidity, while household bleach has a pH of about 13, making it strongly alkaline; pure water at pH 7 is neutral.”
Usage Examples
- 1
“The team applied ph scale best practices to improve their chemistry outcomes significantly.”
- 2
“Understanding ph scale is essential for anyone building a career in STEM.”
When & How to Use
Use 'pH Scale' when working in Chemistry contexts where the ph scale is a logarithmic measure of the concentration of hydrogen ions (h+) in a solution, ranging from 0 (most acidic) to 14 (most basic/alkaline), with 7 being neutral.
- ▸Applying ph scale principles during a chemistry project or initiative
- ▸Explaining ph scale to a junior team member or stakeholder unfamiliar with STEM
- ▸Evaluating options or proposals using ph scale as a decision-making criterion
Etymology & Origin
The term 'pH Scale' derives from professional usage and entered STEM professional usage as the field formalised in the 20th century.
History & Evolution
The concept of ph scale has evolved alongside STEM. Early practitioners relied on informal methods; structured approaches emerged with the professionalisation of chemistry in the mid-20th century. Today, ph scale is a standard part of STEM practice globally.
Synonyms
- acidity scale
- hydrogen ion scale
- acid-base scale
Images
CC-licensed · free to useVideo
Related Terms
- Acid
- Base
- Buffer Solution
- Titration