Question

In: Chemistry

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
Next > < Previous

Related Solutions

Consider the sublimation of iodine at 25.0 °C. I2(s) → I2(g) a. Find ΔG°rxn at 25.0...
Consider the sublimation of iodine at 25.0 °C. I2(s) → I2(g) a. Find ΔG°rxn at 25.0 °C. b. Find ΔGrxn at 25.0 °C under the following nonstandard conditions: i. PI2 = 1.00 mmHg ii. PI2 = 0.100 mmHg c. Explain why iodine spontaneously sublimes in open air at 25 °C. 2) Balance the following redox reaction in basic aqueous solution. Cl2(g) → Cl– (aq) + ClO– (aq)
Hydrogen sulfide gas H2S, burns in oxygen to give sulfure dioxide, SO2, and water. Write the...
Hydrogen sulfide gas H2S, burns in oxygen to give sulfure dioxide, SO2, and water. Write the equation for the reaction, giving molecular, molar, and mas interpreations below the equation.
A.) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)⇌NH3(g)+H2S(g) 1.)This...
A.) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)⇌NH3(g)+H2S(g) 1.)This reaction has a Kp value of 0.120 at 25 ∘C. What is the initial pressure of H2S(g) in the flask? Express your answer numerically in atmospheres. B.) For the reaction aA+bB⇌cC+dD the reaction quotient, Q, is given by the expression Q=[C]c[D]d[A]a[B]b under any conditions. The value of Q is equal to Konly at equilibrium. 1.) The following reaction was carried out in a 2.75...
Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)⇌NH3(g)+H2S(g) This reaction...
Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)⇌NH3(g)+H2S(g) This reaction has a Kp value of 0.120 at 25 ∘C.An empty 5.00-L flask is charged with 0.350 g of pure H2S(g), at 25 ∘C. Part A: What is the initial pressure of H2S(g) in the flask? Part B: In addition to the H2S already present in the flask, solid NH4HS is added until there is excess unreacted solid remaining. What are the partial pressures of...
Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)?NH3(g)+H2S(g) This reaction...
Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)?NH3(g)+H2S(g) This reaction has a Kp value of 0.120 at 25 ?C. An empty 5.00-L flask is charged with 0.400g of pure H2S(g), at 25 ?C. What is the initial pressure of H2S(g) in the flask?
1) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)⇌NH3(g)+H2S(g) This...
1) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)⇌NH3(g)+H2S(g) This reaction has a K value of 0.120 at 25 ∘C. an empty 5.00-L flask is charged with 0.400 g of pure H2S(g), at 25 ∘C. What is the initial pressure of H2S(g) in the flask?
Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)?NH3(g)+H2S(g) This reaction...
Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction NH4HS(s)?NH3(g)+H2S(g) This reaction has a Kp value of 0.120 at 25 ?C. An empty 5.00-L flask is charged with 0.300g of pure H2S(g), at 25 ?C. C) What are the partial pressures of NH3 and H2S at equilibrium, that is, what are the values of PNH3 and PH2S, respectively? D) What is the mole fraction, x, of H2S in the gas mixture at equilibrium? E) What is...
The dissociation of molecular iodine into iodine atoms is represented as I2(g) ⇌ 2I(g)
The dissociation of molecular iodine into iodine atoms is represented as I2(g) ⇌ 2I(g) At 1000 K, the equilibrium constant Kc for the reaction is 3.80 × 10−5. Suppose you start with 0.0461 mol of I2 in a 2.27−L flask at 1000 K. What are the concentrations of the gases at equilibrium?What is the equilibrium concentration of I2?MWhat is the equilibrium concentration of I?M
4. A sample of orange juice was titrated with 0.0286 M I2 solution. A 100 mL...
4. A sample of orange juice was titrated with 0.0286 M I2 solution. A 100 mL sample of juice took 9.89 mL of I2 to reach the starch end point. a. Write the reaction of vitamin C with iodine. b. What is the stoichiometric ratio of vitamin C to iodine in the reaction? c. What is the concentration of the vitamin C in the sample titrated? ( In units of mg VitC/ 100 mL juice). d. How much of the...
Iodine and bromine react to give iodine monobromide, IBr I2+Br2 is in equilibrium to yield 2IBr...
Iodine and bromine react to give iodine monobromide, IBr I2+Br2 is in equilibrium to yield 2IBr What is the equilibrium composition of a mixture at 115°C that initially contained 1.30 x 10 to the negative third 1.30 mol each of iodine and bromine in a 5.00 L vessel? The equilibrium constant Kc for this reaction at 115°C is 55.8. I2 = M ? Br2= M ? IBr= M ?
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT