Question

For a weak base of concentration \(C\) and degree of dissociation \(\alpha\), what is the correct relation between \(K_b\) and \(C\)?

• A. \(K_b = C\alpha\)
• B. \(K_b = C\alpha^2\)
• C. \(K_b = \dfrac{\alpha}{C}\)
• D. \(K_b = \dfrac{C}{\alpha^2}\)

Hint:

For weak electrolytes (weak acids or weak bases), when the degree of dissociation \(\alpha\) is very small, we use the approximation \(1-\alpha \approx 1\). Thus, the relation becomes: \(K = C\alpha^2\).

Answer 1

The Correct Option is B