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Solutions
The Correct Answer is: (C) acidic or basic nature
Explanation:
The pH scale is a numeric scale ranging from 0 to 14, used to measure the acidity or basicity (alkalinity) of a solution. The term pH stands for "potential of Hydrogen", and it reflects the concentration of hydrogen ions (H⁺) in a solution. A pH less than 7 indicates an acidic solution, a pH of 7 indicates a neutral solution (like pure water), and a pH greater than 7 indicates a basic (alkaline) solution.
Information Booster:
• pH < 7 → Acidic (e.g., lemon juice, vinegar)
• pH = 7 → Neutral (e.g., pure water)
• pH > 7 → Basic/Alkaline (e.g., soap, baking soda)
• The pH scale is logarithmic, meaning each unit represents a 10-fold change in H⁺ ion concentration.
• pH is measured using pH paper, universal indicator, or digital pH meters.
• The scale was introduced by Søren P. L. Sørensen in 1909.