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- Help me understand! 10 ml of a solution contains 0.1M NH4Cl + 0.01M NH4OH. Which addition would not change the PH of the solution?
- #Chemistry
- #Engineering
- #Physical and Chemical Equilibria
- #Birla Institute of Technology & Science Admission Test
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 =
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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