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A 2 5 . 0 0 m L aliquot of a 0 . 0 5 1 8 8 M I 2 solution was titrated with

25.00 m L

aliquot of a

0.05188 M I_{2}

solution was titrated with

12.21 m L

of a

N a_{2} S_{2} O_{3}

to a starch endpoint. What is the molarity

(M)

of the

N a_{2} S_{2} O_{3}

solution?

Give your answer to

4

places after the decimal. Do not enter units.

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