Final answer:
The conjugate base of a weak acid is a strong base, not a weak base.
Step-by-step explanation:
The statement "The conjugate base of a weak acid is a weak base and vice versa" is false. The conjugate base of a weak acid is actually a strong base. This is because when a weak acid loses a proton, it forms its conjugate base, which is capable of accepting a proton from water to reform the weak acid.
For example, the weak acid acetic acid (CH3COOH) loses a proton to form its conjugate base, the acetate ion (CH3COO-). The acetate ion is a strong base because it can accept a proton from water to reform acetic acid.