A Student Working on Her Research Project Will Do a Synthesis

Short Answer

A student working on her research project will do a synthesis which involves bubbling chlorine gas through the aqueous reaction mixture in a closed system. The outlet from the system goes through a scrubber, which contains some sodium thiosulfate solution. The sodium thiosulfate will react with the chlorine passing through the scrubber to produce harmless chloride ion and sulfate ion. This prevents the chlorine from going up the exhaust system and polluting the atmosphere on campus grounds. The reaction is: Cl₂(g)+ S₂O₃^2-(aq)→ SO₄^2-(aq)+ Cl^-(aq)The reaction calls for 15.5 grams of chlorine gas. The student wants enough thiosulfate in the scrubber to be able to handle twice this amount to be on the safe side. How many grams of crystal sodium thiosulfate (which is actually sodium thiosulfate pentahydrate)should the student weigh out for use in the scrubber? Hint: Make sure you balance the equation and focus on units.