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Question

1 L of a buffer solution contains one mole each of CH3COOH & (CH3COO)2Ba. Which of the following options are correct? (pKa of CH3COOH=4.7,log 2=0.3)
  1. pH = 4.7
  2. pH = 5
  3. pOH = 9
  4. pOH = 9.3


Solution

The correct options are
B pH = 5
C pOH = 9
For the given buffer solution pH is given by 
pH=pKa+log[CH3COO][CH3COOH]
1 mole of (CH3COO)2Ba will give 2 moles of CH3COO
pH=4.7+log21
pH=4.7+0.3=5
pOH=145=9

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