An Impure Sample of Sodium Carbonate, Na₂CO₃, Is Titrated with 0.113

question 23

Multiple Choice

An impure sample of sodium carbonate, Na₂CO₃, is titrated with 0.113 M HCl according to the reaction below.
2 HCl(aq) + Na₂CO₃(aq) $\leftrightharpoons$ CO₂(g) + H₂O( $\ell$ ) + 2 NaCl(aq)
What is the percent of Na₂CO₃ in a 0.613 g sample if the titration requires 26.14 mL of HCl? The molar mass of Na₂CO₃ is 106.0 g/mol.

• A) 0.295%
• B) 15.7%
• C) 25.5%
• D) 51.1%
• E) 67.9%

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