ChemistryScalar QuantityNCTB রসায়ন অধ্যায় ১০ (খনিজ সম্পদ ও অম্ল-ক্ষারক)
pH Scale
Bengali: পিএইচ স্কেল•Pronunciation: পিএইচ স্কেল•Symbol: \text{pH}
Standard Definition:
A logarithmic scale used to specify the acidity or basicity of an aqueous solution.
📐 Mathematical Equation, Units & Dimensions
Defining Mathematical Equation
Standard SI Unit
Dimensionless index (0 to 14)(এককবিহীন স্কেল (০ থেকে ১৪))
Dimensional Analysis
CGS Unit
None
📖 Physical Concept & Comprehensive Explanation
Devised by S.P.L. Sorensen, pH gauges hydronium ion concentration. Neutral solutions at 25 deg C hold pH = 7. Acidic solutions range from 0 to <7; alkaline solutions range from >7 to 14. Human blood requires tight regulation around pH 7.4.
🎯 High-Yield Revision Points
- ✓Formula: pH = -log10[H+].
- ✓pH < 7 is acidic, pH = 7 is neutral, pH > 7 is basic.
- ✓Water self-ionization guarantees pH + pOH = 14 at 25 deg C.
Use Online Solver for pH Scale
Compute step-by-step solutions, verify formulas, and plot interactive diagrams on biggan.me.
❓ Frequently Asked Exam Questions (FAQ)
Common questions in board and competitive entrance examinations
Q1: What is the pH if [H+] = 0.01 M?
pH = -log10(0.01) = -log10(10^-2) = 2 (strongly acidic).