If ` 10.0 mL` of hypo solution `(Na_2S_2O_3. 5H_2 )` is decolorized by `15 mL` of `M//40` iodine solution , then the concentration of hypo solution is `"____" g dm^(-3)`.A. ` 24.6`B. ` 8.6`C. ` 18.6`D. ` 31.6`

If ` 10.0 mL` of hypo solution `(Na_2S_2O_3. 5H_2 )` is decolorized by

1.	If ` 10.0 mL` of hypo solution `(Na_2S_2O_3. 5H_2 )` is decolorized by `15 mL` of `M//40` iodine solution , then the concentration of hypo solution is `"____" g dm^(-3)`.A. ` 24.6`B. ` 8.6`C. ` 18.6`D. ` 31.6`
Answer» Correct Answer - C The balanced equation for the redox reaction is ` 2S_2O_3^(2-) + I_2 rarr 2I^(-) +S_4O_6^(2-)` Applying molarity equation , we have ` (M_1V_1) /n_1 (Na_2S_2O_3) = (M_2V_2)/n_2 (I_2)` `(M_1(10 mL))/2 = ((1//40) (15 mL))/1` or ` M_1 = (1xx 15 xx 2)/(10xx 40) = 3/(40) "mol L"^(-1)` Strenght of hypo solution ` = ("Molarity" ) xx ("Molar Mass")` ` =(3/(10) "mol L"^(-1)) (248 "gmol"^(-1))` ` =18.6 "g L"^(-1)` ` =18.6 "g dm"^(-3)`.

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If ` 10.0 mL` of hypo solution `(Na_2S_2O_3. 5H_2 )` is decolorized by `15 mL` of `M//40` iodine solution , then the concentration of hypo solution is `"____" g dm^(-3)`.A. ` 24.6`B. ` 8.6`C. ` 18.6`D. ` 31.6`

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