Some people have an allergic reaction to the food preservative sulfite (SO32−). Sulfite in wine was measured by the following procedure: To 50.0 mL of wine were added 5.00 mL of solution containing (0.8043 g KIO3 + 5 g KI)/100 mL. Acidification with 1.0 mL of 6.0 M H2SO4 quantitatively converted IO3− into I3−. The I3− reacted with SO32− to generate SO42−, leaving excess I3− in solution. The excess I3− required 12.86 mL of 0.04818 M Na2S2O3 to reach a starch end point. lO_3^- + 8l^- + 6H^+ rightarrow 3l_3^- + 3H_2O l_3^- + SO_3^2 - + H_2O rightarrow 3l^- + SO_4^2- + 2H^+ l_3^- + 2S_2O_3^2- rightarrow 3l^- + S_4O_6^2- Find the concentration of sulfite in the wine. Express your answer in mol/L and in mg SO32− per liter. _____mol/L HINTS: Don't use scientific notation, do put zero before decimal point, carefully evaluate significant figures.
Some people have an allergic reaction to the food preservative sulfite (SO32−). Sulfite in wine was measured by the following procedure: To 50.0 mL of wine were added 5.00 mL of solution containing (0.8043 g KIO3 + 5 g KI)/100 mL. Acidification with 1.0 mL of 6.0 M H2SO4 quantitatively converted IO3− into I3−. The I3− reacted with SO32− to generate SO42−, leaving excess I3− in solution. The excess I3− required 12.86 mL of 0.04818 M Na2S2O3 to reach a starch end point.
lO_3^- + 8l^- + 6H^+ rightarrow 3l_3^- + 3H_2O l_3^- + SO_3^2 - + H_2O rightarrow 3l^- + SO_4^2- + 2H^+ l_3^- + 2S_2O_3^2- rightarrow 3l^- + S_4O_6^2-
Find the concentration of sulfite in the wine. Express your answer in mol/L and in mg SO32− per liter.
_____mol/L HINTS: Don't use scientific notation, do put zero before decimal point, carefully evaluate significant figures.
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