Question

A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3(aq) with 50.0 mL...

A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3(aq) with 50.0 mL of 0.300 M NH4Cl(aq). The pKb of NH3  is 4.74.

7.50 mL of 0.125 M NaOH is added to the 100.0 mL of the original buffer solution prepared in Question 1 (no HCl added). Calculate the new NH3 concentration for the buffer solution.
Calculate the new NH4Cl concentration for the buffer solution.
Calculate the new pH of the solution.

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Homework Answers

Answer #1

Before addition of NaOH solution:

The number of moles of ammonia present are

The number of moles of ammonium chloride present are

The number of moles of NaOH added is

NaOH reacts with ammonium chloride to form ammonia.

The total number of moles of ammonia is

The concentration of ammonia is

The total number of moles of ammonium chloride is

The concentration of ammonium chloride is

For basic buffer solution,

Substitute values in the above expression.

Hence, the pH of the buffer solution is

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