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Moles = 0.4 × 0.25 = 0.1 mol . Mass of KNO₃ = 0.1 × 101 = 10.1 g . Total mass = 250 × 1.1 = 275 g . Mass % = (10.1/275) × 100 ≈ 3.673% .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Solubility - of Solids and Gases in Liquids Henry's Law
pH = -log [H+] , 2.5 = -log [H+] , [H+] = 10⁻².⁵ ≈ 3.16 × 10⁻³ .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis
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