The conjugate acid of a weak base is always stronger. What will be the decreasing order of basic strength of the following conjugate bases?
OH-, RO-, CH3COO-, Cl-
The relative strengths of acids are determined by the extent to which they dissociate in the aqueous solutions. In solutions where the concentration is same, stronger acids tend to ionize to a greater extent; as a result, they yield higher concentrations of hydronium ions than the weaker acids.
Conjugate acids of the following base will be:
OH- - H2O CH3COO- - CH3COOH Cl- - HCl RO- - ROH
The decreasing order of acidic strength will be;
Cl- > CH3COO- > OH- >RO-,
Conjugate base of a strong acid is weak therefore the decreasing order of basic strength will be;
RO- > OH- > CH3COO- > Cl-