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After mixing: [HY] = 0.1 M , [Y-] = 0.05 M , pKa = 5 , pH = 5 + log (0.05/0.1) = 5 - 0.301 = 4.7 .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Relationship Between Kp Kc and Factors Affecting Equilibrium - Le Chatelier
Total volume = 3V, [HX] = (0.1V/3V) = 0.0333 M , [X-] = (0.05 × 2V/3V) = 0.0333 M , pH = 4 + log (0.0333/0.0333) = 4 .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases
After mixing: [HX] = (0.2/2) = 0.1 M , [X-] = (0.1/2) = 0.05 M . pH = pKa + log ([X-]/[HX]) = 5 + log (0.05/0.1) = 5 - 0.301 = 4.7 .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Homogeneous and Heterogeneous Equilibria and Applications of Equilibrium Constant
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