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P following titration. What volume of the solution

W will be required to react with 0.158 g of \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \) ? \( \mathrm{S}_{2} \mathrm{O}_{3}^{2-}+\mathrm{MnO}_{4}^{-}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{MnO}_{2}(\mathrm{~s})+\mathrm{SO}_{4}^{2-}+\mathrm{OH}^{-} \)
(1) \( 80 \mathrm{ml} \)
(2) \( 26.67 \mathrm{ml} \)
(3) \( 13.33 \mathrm{ml} \)
(4) \( 16 \mathrm{ml} \)
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