Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl has pH 9.25 . Then fine out pKb of NH₄OH

Solution Of 01 N Nhoh And 01 N Nhcl Has Chemistry QuestionSolution Of 01 N Nhoh And 01 N Nhcl Has Chemistry Question

Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl has pH 9.25 . Then fine out pKb of NH₄OH

Options

(a) 9.25
(b) 4.75
(c) 3.75
(d) 8.25

Correct Answer:

4.75

Explanation:

Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl is a buffer solution.
According to Henderson equation,
The pH of a basic buffer,
pH = 14 -pK(b) – log{C(salt)/C(base)}.
⇒pK(b) = 14-pH-log{C(salt)/C(base)},
⇒ pK(b) = 14-9.25-log{0.1/0.1}.
⇒ pK(b) = 14-9.25 = 4.75.
Therefore pK(b) of NH₄OH = 4.75.

AddThis Website Tools
admin:

Related Questions

  1. The number of water molecules in gypsum and in plaster of paris are respectively
  2. Which of the following ions can cause coagulation of proteins
  3. The compound which contains all the four 1°,2°,3° and 4° carbon atoms is
  4. Which one of the following is not a condensation polymer
  5. What is the oxidation number of iron in [Fe(H₂O)₅(NO)⁺] SO₄