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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

What fraction of an indicator (Hln) is in basic form at a pH of 6 if the p K a of the indicator is 5 ?

Options

  1. A1 2
  2. B1 11
  3. C10 11
  4. D1 10

Correct answer

C. 10 11

Step-by-step solution

p H = p K a + l o g ( I n - ) ( H I n ) 6 = 5 + l o g ( I n - ) ( H I n ) ( I n - ) ( H I n ) = 1 0 ( I n - ) ( I n - ) + ( H I n ) = 10 11

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