Aqueous solution of sodium carbonate is alkaline justify
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Sodium carbonate is a salt of a strong base and a weak acid. when dissolved in water, since carbonic acid is weak, it has a low pKa. This makes the H3O+ from water to be removed from solution to form HCO3-, leaving an excess of OH- in the solution, thus making the solution alkaline.
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An aqueous solution of sodium carbonate gives alkaline tests because Na2CO3 undergoes hydrolysis forming sodium hydroxide.
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