Sodium Thiosulfate (Na₂S₂O₃,molar Mass = 158 $\to$ 2 I^-(aq)+ S₄O₆^2-(aq)
A)100%
B)48

question 95

Multiple Choice

Sodium thiosulfate (Na₂S₂O₃,molar mass = 158.2 g/mol) is used in photography.The purity of a Na₂S₂O₃ solution labeled as 0.2043 M is checked by redox titration.It is found that 0.100 L of this solution requires 40.21 mL of 0.246 M iodine solution to reach the equivalence point.What is the percent purity of the sodium thiosulfate solution? I₂(aq) + 2 S₂O₃^2-(aq) $\to$ 2 I^-(aq) + S₄O₆^2-(aq)

• A)100%
• B)48.4%
• C)96.8%
• D)24.2%
• E)84.4%

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