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The base ionization constant, Kb, of ammonia in water is 1.8 × 10-5. The value of the acid ionization constant, Ka, of the conjugate acid, is closest to
- a)5.6 × 10-10
- b)1.8 × 109
- c)7.0 × 10-7
- d)5.6 × 104
Correct answer is option 'A'. Can you explain this answer?
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The base ionization constant, Kb, of ammonia in water is 1.8× 10...
For the ammonia (NH3) and its conjugate acid ammonium ion (NH4+), we have the following equilibrium reactions in water:
NH3 + H2O ⇌ NH4+ + OH-
NH3 + H2O ⇌ NH4+ + OH-
- The base ionization constant, Kb, is given as 1.8 × 10-5.
- It represents the equilibrium constant for the reaction of ammonia with water to form ammonium ions and hydroxide ions.
- The acid ionization constant, Ka, for the conjugate acid ammonium ion (NH4+), is related to Kb through the following expression:
Ka × Kb = Kw
- where Kw is the ion product constant for water at a given temperature, which is approximately 1.0×10-14 at room temperature.
- The value of Ka can be calculated as follows:
Ka × Kb = Kw
or, Ka × (1.8 × 10-5) = 1.0 × 10-14
or, Ka = (1.0 × 10-14) / (1.8 × 10-5)
or, Ka ≈ 5.6 × 10-10
or, Ka × (1.8 × 10-5) = 1.0 × 10-14
or, Ka = (1.0 × 10-14) / (1.8 × 10-5)
or, Ka ≈ 5.6 × 10-10
- So, the value of the acid ionization constant, Ka, of the conjugate acid (NH4+) is approximately 5.56 × 10-10.
Hence, the value of the acid ionization constant, Ka, of the conjugate acid, is closest to 5.6 × 10-10
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The base ionization constant, Kb, of ammonia in water is 1.8× 10...
Calculating Ka of the Conjugate Acid
- The relationship between Ka and Kb for a conjugate acid-base pair is given by the equation:
Ka x Kb = Kw = 1.0 x 10^-14
- Given that Kb of ammonia is 1.8 x 10^-5, we can calculate the value of Ka for the conjugate acid as follows:
Ka = Kw / Kb
Ka = 1.0 x 10^-14 / 1.8 x 10^-5
Ka ≈ 5.6 x 10^-10
Therefore, the value of the acid ionization constant, Ka, of the conjugate acid is closest to 5.6 x 10^-10, which corresponds to option 'A'.
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The base ionization constant, Kb, of ammonia in water is 1.8× 10-5. The value of the acid ionization constant, Ka, of the conjugate acid, is closest toa)5.6 × 10-10b)1.8 × 109c)7.0 × 10-7d)5.6 × 104Correct answer is option 'A'. Can you explain this answer?
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The base ionization constant, Kb, of ammonia in water is 1.8× 10-5. The value of the acid ionization constant, Ka, of the conjugate acid, is closest toa)5.6 × 10-10b)1.8 × 109c)7.0 × 10-7d)5.6 × 104Correct answer is option 'A'. Can you explain this answer? for UGC NET 2024 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about The base ionization constant, Kb, of ammonia in water is 1.8× 10-5. The value of the acid ionization constant, Ka, of the conjugate acid, is closest toa)5.6 × 10-10b)1.8 × 109c)7.0 × 10-7d)5.6 × 104Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for UGC NET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The base ionization constant, Kb, of ammonia in water is 1.8× 10-5. The value of the acid ionization constant, Ka, of the conjugate acid, is closest toa)5.6 × 10-10b)1.8 × 109c)7.0 × 10-7d)5.6 × 104Correct answer is option 'A'. Can you explain this answer?.
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