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Sulfide in a water sample is coulometrically titrated with iodine (H2S + I2 ----> S +...

Sulfide in a water sample is coulometrically titrated with iodine (H2S + I2 ----> S + 2H+ + 2I-). If a 10.00 mL aliquot of the water sample requires a current of 0.75 A for 5.4 minutes to reach the end point, what is the molarity of the sulfide in the water sample?

(A) 0.5036 (B) 0.1259 (C) 0.0051   (D) 0.0013

Solutions

Expert Solution

             (H2S + I2 ----> S + 2H+ + 2I-).

                 S-2 + 2e- -------> S

                     Z =2

                     F   = 96500C

                      M   = 34g/mole

                    t      = 5.4minutes = 5.4*60   = 324sec

                   W   = MCt/ZF

                        = 34*0.75*324/2*96500   = 0.043g

molarity = W*1000/G.M.Wt * volume of solution in ml

                 = 0.043*1000/34*10    = 0.1259M

molarity of sulfide is 0.1259M

(B) 0.1259

              W     = M

queen_honey_blossom answered 1 year ago
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