Answer:
Sodium forms salts either with strong acids\[(HCL,\,HN{{O}_{3}},\,{{H}_{2}}S{{O}_{4}}\,etc)\]or with weak acids\[({{H}_{2}}C{{O}_{3}},\,C{{H}_{3}}COOH,\,{{H}_{3}}P{{O}_{4}}\,etc)\]. Salts with strong acids such as NaCI do not hydrolyse with water. Therefore, the aqueous solutions of these salts are neutral. But the salts with weak acids such as\[C{{H}_{3}}COONa\] and\[N{{a}_{2}}C{{O}_{3}}\] get easily hydrolysed to form a strong base and weak acid
\[C{{H}_{3}}COONa+{{H}_{2}}O\xrightarrow{}\underset{(Weak)}{\mathop{C{{H}_{3}}COOH}}\,+\underset{\text{(Strong)}}{\mathop{NaOH}}\,\]
\[N{{a}_{2}}C{{O}_{3}}+2{{H}_{2}}O\to \,\,\underset{(Weak)}{\mathop{{{H}_{2}}C{{O}_{3}}}}\,\,\,\,\,+\,\,\,\,\,\underset{(Strong)}{\mathop{2NaOH}}\,\]
Thus, the aqueous solutions of these salts are of alkaline nature.
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