e peroxydisulfate ion (320g2-) reacts with the iodide ion in aqueous solution vi
ID: 570330 • Letter: E
Question
e peroxydisulfate ion (320g2-) reacts with the iodide ion in aqueous solution via the realo S2082-(aq) +31-29042-(aq) +13-(aq) n aqueous solution containing 0.050 MofS2082- ion and 0.072 M ofT is prepared, and the progress of the reaction follonoed by easuring . The data obtained is given in the table below. Leng 22) What is the concentration (M) of S20g2- remaining at 1200 s? B) 0.038 A)-0.038 C)-0.012 D) 40.035 E) 0.012 23) 23) What is the concentration (M) of S20g2- remaining at T-0? A) 0.15 B) 0.022 C) 0.050 D) 0.072 E) no S20g2- is remaining at T-O (AS
Explanation / Answer
22. At t= 1200 conc of I- reacted is 0.072-0.037 = 0.035M.
3mole of I- reacts with one mole of S2O8 2-. Hence at t= 1200 amount of s2o8 reacted is 0.035/3 = 0.0116M. Amount of s2o8 remaining is 0.05 - 0.0116 = +0.0383M.
23. At t=0 no reaction occured hence conc of s208 is + 0.05M
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