A) it contains more carbonate ions than \[{{H}_{2}}O\] molecules
B) contains more sodium ions than carbonate ions
C) Na+ ions react with water
D) carbonate ions react with\[{{H}_{2}}O\]
Correct Answer: D
Solution :
Sodium carbonate is the salt of a weak acid \[({{H}_{2}}C{{O}_{3}})\]with a strong base (NaOH). In solution, it is completely ionized as \[N{{a}^{+}}\] and \[CO_{3}^{2-}\] ions. The \[CO_{3}^{2-}\] ion being the conjugate base of the weak acid \[{{H}_{2}}C{{O}_{3}}\] undergoes hydrolysis in solution according to the equilibrium of hydrolysis: \[CO_{3}^{2-}+{{H}_{2}}OO{{H}^{-}}+HCO_{3}^{-}\] The \[O{{H}^{-}}\]ion produced being a strong base makes the solution basic, hence the pH of the solution will be greater than 7.
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