pH scale

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Definition
  1. Noun:
    • A logarithmic scale from 0 to 14 used to specify the acidity or alkalinity of an aqueous solution: The pH scale is a scientific measure that indicates the concentration of hydrogen ions in a solution. A pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline).
Usage
  • The pH scale is a fundamental concept in chemistry, biology, and environmental science.
  • It is used to describe the acidity or basicity of substances like water, soil, blood, and beverages.
  • The term is often used with verbs like , , , , , or .
Examples
  • Noun:
    • Pure water has a pH of 7, which is neutral on the pH scale.
    • Scientists use litmus paper to estimate where a substance falls on the pH scale.
    • The pH scale is logarithmic, meaning a solution with a pH of 5 is ten times more acidic than one with a pH of 6.
Advanced Usage
  • "on the pH scale": used to indicate a specific point or range of measurement.
    • Lemon juice has a value of about 2 on the pH scale.
  • "pH scale reading/measurement/value": refers to the specific numerical result obtained from testing.
    • The pH scale reading for the soil sample was 8.3.
Variants and Related Words
  • pH (noun): The specific numerical value on the pH scale.
    • The pH of the pool water needs to be checked daily.
  • pH meter (noun): An electronic device used to measure pH precisely.
  • Acidic (adj): Having a pH less than 7.
  • Alkaline/Basic (adj): Having a pH greater than 7.
  • Neutral (adj): Having a pH of 7.
Synonyms
  • Acidity scale: A less common term emphasizing the measurement of acidity.
  • Hydrogen ion concentration index: A formal, descriptive synonym.
Related Phrases
  • pH level: Often used interchangeably with "pH" to mean the specific value.
    • Maintaining the correct pH level is crucial for the aquarium.
  • pH balance: Refers to the state of equilibrium, especially in biological contexts.
    • The shampoo is designed to respect the skin's natural pH balance.
Noun
  1. (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);

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