Which of the following expression is correct?
Correct answer: C. Ka × Kb = 10-14
- A. Ka × Kb = pKw
- B. Ka × Kb = 14
- C. Ka × Kb = 10-14
- D. Ka × Kb = 1014
Explanation
The correct relationship between the ionization constants of an acid and its conjugate base is given by Ka × Kb = Kw. At 25°C, the ionization constant of water (Kw) is 10-14. Therefore, the expression Ka × Kb = 10-14 is correct. Option A is incorrect because it confuses Kw with its logarithmic form pKw. Option B is incorrect as it incorrectly equates the product to 14 instead of 10-14. Option D is incorrect because it incorrectly displays the product as 1014, which is the inverse of the correct value.
Last updated
About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
Practise Acids, Bases and Salts
314 free Acids, Bases and Salts MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
All of the following are postulates of Arrhenius theory of ionization except
Which of the following aqueous solution will be basic?
A start of reaction, concentration of reactants are on
An acid that can act as an oxidizing, dehydrating and acid-producing agent is
Which of the following compounds is the strongest Bronsted acid