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Question

Explain why the aqueous solution of sodium carbonate is alkaline?


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Solution

Aqueous solution of Sodium carbonate is alkaline

  • The aqueous solution of Sodium carbonate (Na2CO3) is alkaline in nature.
  • Because Sodium carbonate is a salt of a strong base and weak acid.
  • When Sodium carbonate is dissolved in water it gets hydrolyzed and forms a weak acid Carbonic acid (H2CO3) and a strong base Sodium hydroxide (NaOH).
  • Following is the reaction:
    Na2CO3(aq.)SodiumCarbonate+2H2OWater(l)H2CO3Carbonicacid(g)+2NaOHSodiumhydroxide(aq.)

Therefore, an aqueous solution of sodium carbonate is alkaline in nature.


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