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Phenol (C₆H₅OH) reacts with NaOH to form sodium phenoxide (C₆H₅ONa), demonstrating its acidic nature.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Alcohols - Dehydration Oxidation Esterification
Total volume = 4V, initial [HB] = 0.107 M , [B-] = (0.03V/4V) = 0.0075 M , pKa = 6 , pH = 6 + log (0.0075/0.08) = 6 - 1.03 = 4.97 .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Homogeneous and Heterogeneous Equilibria and Applications of Equilibrium Constant
Reaction: 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O. Moles of NaOH = 8/40 = 0.2 mol. 2 mol NaOH produce 1 mol Na₂SO₄; 0.2 mol produce 0.1 mol. Mass = 0.1 × 142 = 14.2 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
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