A 0.1504-g sample of impure Na₂CO₃ (106.00g/mol) was analyzed via Volhard method. After adding 50.0 mL of 0.07106 M AgNO₃, the sample was back-titrated with 0.06485 M KSCN requiring 11.69 mL to reach the end point. What is the purity of the Na₂CO₃ sample?    CHOICES: 98.5% 95.7% 89.0% None of these

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