Question

A 25. 0-ml sample of 1. 00 mnh3is titrated with 0. 15 mhcl. what is the ph of the solution after 15. 00 ml of acid have been added to the ammonia solution? kb= 1. 8 10-5

Answer 1

The pH can be determined by the base dissociation constant value (Kb). The pH of the solution after 15 mL of ammonia is added to the solution will be 10.26.

What is pH?

The pH of the solution can be given by the pOH value that is determined by the concentration and the base dissociation constant.

The balanced chemical reaction is given as,

HCl + NH₃ → NH₄Cl

The moles before reaction was 0.015L× 0.15M =  0.00225 moles and, 0.025 L × 1.00 M = 0.025 moles

The moles after reaction are 0.00225 moles - 0.025 moles = 0.02275 moles

pOH is calculated as,

pOH = 4.74 + log ( 0.00225 ÷ 0.02275 )

= 3.73

Further pH is calculated as,

pH = 14 - 3.73

= 10.26

Therefore, 10.26 is the pH of the solution.

Learn more about pH here:

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