10 ml of a solution contains 0.1M NH4Cl + 0.01M  NH4OH. Which addition would not change the PH of the solution? 

  • Option 1)

    Adding 1ml water 

  • Option 2)

    Adding 5ml of 0.1M NH4Cl

  • Option 3)

    Adding 5ml of 0.1M NH4OH

  • Option 4)

    Adding 10ml of 0.1NH4Cl

 

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

 

 pOH of a buffer solution = pK_b\:+\:log\frac{[salt]}{base}

pH = 14 - pOH

Adding 1ml of water would not affecr the concentration of salt or base as much as to make a change in pH of the solution. That is not the case with other options.


Option 1)

Adding 1ml water 

This option is correct.

Option 2)

Adding 5ml of 0.1M NH4Cl

This option is incorrect.

Option 3)

Adding 5ml of 0.1M NH4OH

This option is incorrect.

Option 4)

Adding 10ml of 0.1NH4Cl

This option is incorrect.

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