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Question

Calculate CH3COO- concentration in HCl solution. If the dissociation constant of 0.01M CH3COOH is 1.8x10-5?


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Solution

Calculating CH3COO- concentration in HCl solution

  1. Step 1: Dissociation of 0.01M HCl and CH3COOH
    HClCl+H+
    CH3COOHCH3COO+H+
  2. Step 2: Initial concentration
    CH3COOH0.01MCH3COO0+H+0
  3. Step 3: Determination of concentration of CH3COO-
    The value of the dissociation constant (Ka)=1.8×10-5
    Ka=[CH3COO][H+][CH3COOH][CH3COO]=Ka[CH3COOH][H+][CH3COO]=(1.8x10-5x0.01)0.1[CH3COO]=1.8x10-6

Therefore, the concentration of CH3COO- is 1.8×10-6mol L-1.


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