CBSENEETJEEClass 10
What is pH?
Answer
pH is the negative logarithm of the hydrogen ion concentration, pH = -log[H⁺], and it measures how acidic or basic a solution is.
The working
Definition
pH is a number that tells the acidity or basicity of an aqueous solution based on its H⁺ ion concentration.
Formula
It is calculated as pH = -log[H⁺], where [H⁺] is the molar concentration of hydrogen ions.
Reading the value
pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is basic at 25 °C.
Key point
The scale ranges from 0 to 14, and each unit change means a tenfold change in H⁺ ion concentration.
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