100ml of 1N NH4OH (Kb=5x10-5) is neutralized to equivalence point by 1N HCl. The PH of solution at equivalence point is

  • Option 1)

    2

  • Option 2)

    2.5

  • Option 3)

    3

  • Option 4)

    5

 

Answers (1)

As we discussed in concept

Buffer Solutions -

The solutions which resist change in pH on dilution or with addition of small amounts of acid or alkali are called buffer solution.  

- wherein

Many body fluids  e.g.  blood

 

 pH in case of strong acid and a weak base at equivalence point is given by

pH = 7-\frac{1}{2}pK_{b}

       = 7-\frac{1}{2}p(5\times 10^{-5})

      = 7-2.1\approx 5


Option 1)

2

This option is incorrect.

Option 2)

2.5

This option is incorrect.

Option 3)

3

This option is incorrect.

Option 4)

5

This option is correct.

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