What is the difference between conjugate acid and the conjugate base.

 [Al(H2O)6]3+ + H2O ⇋ [Al(H2O)5(OH)]2+ + H3O+  Ka ~10-5 [1] cf acetic acid  The OH- is bound as a ligand to the Al3+ cation thus the complex has an overall charge of...

(d) : Conjugate base is formed by the removal of H+ from acid. H2PO4– → HPO42– + H+

(d) : Conjugate base of OH– is O2–. OH– ⇋ O2– + H+

Conjugate acid is H2CO3 a conjugate acid is CO3 2- 

HCl + HOH -------->  Cl- + H3O+  CH3COOH + HOH -------->  CH3COO- + H3O+  HCl is strong acid but chloride ion is a weak base similarly CH3COOH is weak acid but CH3COO-...

Ka x Kb =Kw  Kb= Kw/Ka  =1 x10-14/1.8x10-8  =5.55x10-7

(b) Formic acid is stronger than acetic acid due to its chemical composition. Formic acid is an organic acid as well as active acid in an organic acid.

 Cl - ion Conjugate base H3O+ ion Conjugate base,

If (A) is correct but (R) is wrong

The correct answer is (a) O2-