Ingredients: solution of KIO 3 0.1 M (dissolve 21.4 g of KIO 3 in one liter of water), solution of NaHSO 3 0.25 M (dissolve 26 g of NaHSO 3 in one liter of water and the solution is stable for 3 days), starch solution 1% (w / w) (boil 500 mL of H 2 O in a beaker of 1 L. In a 50 mL beaker to prepare a slurry of 10 g starch in 20 mL H 2 O. Pour the slurry in H 2 O boiling and boil the mixture for 10 minutes. Cool in an ice bath, the hot solution and diluted with H 2 O to one liter)
What you need
: 10 150 mL beakers, 2 cylinders, 50 mL, 2 flasks 500 mL
How it works: In a 500 mL Erlenmeyer flask pour 150 mL of H 2 O and 150 mL of the KIO 3 , in another flask, 500 ml pour 60 mL of soluione of NaHSO 3 , 30 mL of starch solution and 210 mL of H 2 O. Prepare the 10 beaker to the table by using these two solutions bulk.
What you need
: 10 150 mL beakers, 2 cylinders, 50 mL, 2 flasks 500 mL
How it works: In a 500 mL Erlenmeyer flask pour 150 mL of H 2 O and 150 mL of the KIO 3 , in another flask, 500 ml pour 60 mL of soluione of NaHSO 3 , 30 mL of starch solution and 210 mL of H 2 O. Prepare the 10 beaker to the table by using these two solutions bulk.
simultaneously pour the contents of the beaker at 5 in the corresponding beaker B.
solutions inside the beaker, colorless, become dark blue due to the formation of the complex starch-iodine, iodine formed following the reaction between The NaHSO 3 and KIO 3
6 HSO 3 - + 2 I0 3 - 6 → SO 4 2 - + 2 + 6 H + I-IO
3 - + 5 I-+ 6 H + → 3 I 2 + 3 H 2 O
0 comments:
Post a Comment