Question:

Trial 1 Flask A 25ml of 0.2 M Potassium Iodide (ml) and Volume of 0.2% starch(ml) were added together, Flask B 25 ml of volume 0.2M Ammonium Persulfate and volume of 0.01 M sodium Thiosulfate(ml) were added together, After adding flask A and B together, after 20 sec the solution turned from clear to black. Trial 2 Flask A 25ml of 0.2 M Potassium Iodide (ml) and Volume of 0.2% starch(ml) were added together, Flask B 12.5ml of 0.2 M Ammonium Persulfate, 12.5ml of 0.2 M Ammonium Sulfate(ml), 10 ml of 0.01 M Sodium Thiosulfate(ml) were added together, When flask A and B were added, after 42 sec, it turned from clear to black. Trial 3 Flask A 25ml of 0.2 M Potassium Iodide (ml) and Volume of 0.2% starch(ml) were added together, Flask B 6.25ml of 0.2 M Ammonium Persulfate (ml), 18.75ml of 0.2 M Ammonium Sulfate, and 10ml of 0.01 M sodium Thiosulfate (ml) were added together. After flask A and B were added together, at a min and 26 sec, it turned from clear to black. Trial 4 Flask A 12.5ml of 0.2 M Potassium Iodide (ml), 12.5ml of 0.2 M Potassium Nitrate (ml), 5 ml of 0.2% starch were added together, Flask B 25 ml of 0.2 Ammonium Persulfate, 10ml of 0.01 M Sodium Thiosulfate (ml) were added together after mixing both A and B together, at 42 seconds, it turned clear to black. Trial 5 Flask A 6.25ml of 0.2 M Potassium Iodide, 18.75 ml of 0.2 M Potassium Nitrate, 5ml of 0.2% starch were added together. Flask B 25 ml of 0.2 Ammonium Persulfate, 10ml of 0.01 M Sodium Thiosulfate (ml) were added together, After adding flask A and B together, after 1 min and 28 sec, it turned from clear to black. All at the temp 21.5 C Questions, 1. What was the initial concentration of thiosulfate? A.0.00165 MB.0.00154 MC.0.00077 MD.0.00134 M 2. What was the rate of reaction in Trial 2? Choose the closest answer. A.1.95 x 10-5 M s-1B.1.55 x 10-5 M s-1C.1.83 x 10-5 M s-1D.2.15 x 10-5 M s-1 3. What was the rate of reaction in Trial 3? Choose the closest answer. A.6.98 x 10-6 M s-1B.8.84 x 10-6 M s-1 C.9.55 x 10-6 M s-1D.7.86 x 10-6 M s-1 4. What was the rate of reaction in Trial 4? Choose the closest answer. A.1.83 x 10-5 M s-1B.1.75 x 10-5 M s-1C.2.13 x 10-5 M s-1D.1.92 x 10-5 M s-1 5. What was the rate of reaction in Trial 5? Choose the closest answer. A.9.75 x 10-6 M s-1B.9.15 x 10-6 M s-1C.8.74 x 10-6 M s-1D.8.02 x 10-6 M s-1 6. What was the concentration of peroxodisulfate in Trial 2? A.0.0385 M B.0.0418 MC.0.0488 MD.0.0302 M 7. What was the concentration of peroxodisulfate in Trial 3? A.0.0075 MB.0.0132 MC.0.0192 MD.0.0212 M 8. What was the concentration of iodide in Trial 4? A.0.0460 MB.0.0385 M C.0.0305 M D.0.0411 M 9. What was the concentration of iodide in Trial 5? A.0.0128 MB.0.0202 MC.0.0282 M D.0.0192 M