HARDMCQ SINGLEJEE Mains ChemistryPhysical ChemistryIonic equilibriumAchiever Section

Calculate  the  concentration  of  H⁺  ion  in  mol/L  of 0.010M solution of NH₄Cl? (Kb = 1.8 × 10–6)

A.4.2 × 10–4
B.7.4 × 10–6✓ Correct
C.1.8 × 10–7
D.5.6 × 10–12
Explanation

The hydrolysis of 4 NH Cl  produces a strong acid (HCl) and  a  weak  base  ( 4 NH OH ).  The  reaction  is  given below. 4 2 4 NH Cl H O NH OH HCl The ammonium ion reacts with water to form IONIC EQUILIBRIUM 65 ammonium hydroxide. 4 2 4 Initial Concentration:      c                         0         0 Final Concentration:     c 1  –  x                   cx      cx NH H O NH OH H Therefore, the concentration of + H  = cx Since the ammonium ion is hydrolyzed we can replace ‘x’ with ‘h’ which is the degree of hydrolysis. So,  H  = ch Now, Hydrolysis constant, 2

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