Question:
What does pH value indicate in water?
What does pH value indicate in water?
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Every decrease of one pH unit means the hydrogen ion concentration becomes ten times greater.
Updated On: Jun 9, 2026
- Temperature
- Acidity or alkalinity
- Turbidity
- Conductivity
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The Correct Option is B
Solution and Explanation
Concept:
The pH scale is used to measure the concentration of hydrogen ions \((H^+)\) in a solution. It indicates whether a solution is acidic, neutral, or basic.
Mathematically,
\[
pH=-\log[H^+]
\]
The pH scale generally ranges from 0 to 14.
Step 1: Understand the meaning of pH values. \[ pH < 7 \] indicates an acidic solution. Examples: Lemon juice, vinegar. \[ pH = 7 \] indicates a neutral solution. Example: Pure water. \[ pH > 7 \] indicates a basic (alkaline) solution. Examples: Soap solution, lime water.
Step 2: Relate pH to water quality. The pH value of water tells us whether the water is acidic or alkaline. It does not indicate:
• Temperature
• Turbidity
• Electrical conductivity
Step 3: Choose the correct option. Therefore, pH is a measure of acidity or alkalinity.
Step 1: Understand the meaning of pH values. \[ pH < 7 \] indicates an acidic solution. Examples: Lemon juice, vinegar. \[ pH = 7 \] indicates a neutral solution. Example: Pure water. \[ pH > 7 \] indicates a basic (alkaline) solution. Examples: Soap solution, lime water.
Step 2: Relate pH to water quality. The pH value of water tells us whether the water is acidic or alkaline. It does not indicate:
• Temperature
• Turbidity
• Electrical conductivity
Step 3: Choose the correct option. Therefore, pH is a measure of acidity or alkalinity.
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