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Determine the concentration of ammonia in a commercial window cleaner. in the titration of a 25...

Question:

Determine the concentration of ammonia in a commercial window cleaner. in the titration of a 25 ml sample of the cleaner, the equivalence point is reached after 18.88 ml of .137 m HCl has been added. what is the ph at the equivalence point?

Determination of concentration of weak base such as ammonia and pH of its salt at the equivalence point in a commercial window cleaner when reacted with a strong acid.

To determine the concentration of ammonia in a window cleaner we will consider the number of mMs of HCl acid required to reach the equivalence point. Since the same number of mM will be used for ammonia, by calculation we will arrive at the concentration of ammonia used in cleaner. Further, in order to decide the pH of the final solution at the equivalence point, we will find mM of ions present in the final solution and hence its concentrations and by taking reference of pKa(ammonium) we will find pH at the equivalence point.

Answer and Explanation:

The reaction between ammonia and HCl acid is as follows:

NH3 + HCl = NH4Cl + H2O

Since molarity and normality of NH3 and HCl acid is same we can...

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Titrations with Weak Acids or Weak Bases

from Chemistry 101: General Chemistry

Chapter 11 / Lesson 10
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