Question:
The aqueous solution of sodium carbonate is alkaline. Why?
The aqueous solution of sodium carbonate is alkaline. Why?
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Sodium carbonate is used in laundry detergents due to its alkalinity.
Updated On: Oct 27, 2025
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Solution and Explanation
Sodium carbonate (\( Na_2CO_3 \)) is a salt of a strong base (NaOH) and a weak acid (H\(_2\)CO\(_3\)). When dissolved in water, it undergoes hydrolysis:
\[ Na_2CO_3 + H_2O \rightarrow 2Na^+ + HCO_3^- + OH^- \] Since hydroxide (\( OH^- \)) ions are produced, the solution becomes alkaline.
\[ Na_2CO_3 + H_2O \rightarrow 2Na^+ + HCO_3^- + OH^- \] Since hydroxide (\( OH^- \)) ions are produced, the solution becomes alkaline.
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