elephant toothpaste
In this lab we will remember as much volume as the use of the scale. We will also check the decomposition of hydrogen peroxide (H 2 or 2), catalyzed by potassium iodide (KI). The decomposition of hydrogen peroxide is:
2H 2 O 2 (aq) -> 2H 2 O (l) + O 2 (g)
potassium iodide (KI) is a catalyst because it only increases the reaction rate is not spent as a reagent. However, a small part if it reacts, becoming iodine. The presence of iodine is shown by the brown color in parts of the product. The iodine stain. The reaction is performed in a graduated cylinder rather high, since the product formed vertically upwards and out quickly. That and its texture is called "toothpaste." As hydrogen peroxide is a very strong oxidizer must protect hands with gloves. In addition, the reaction is very fast, it is advisable to wear safety goggles. MATERIAL
graduated cylinder 250 ml, 100 ml graduated cylinder, glass clock, scales, gloves, safety glasses, protective plastic (optional), Chip (optional).
Products:
coloring (optional), liquid detergent (preferably white and pH = 7), hydrogen peroxide (H202) 30% potassium iodide (KI).
PROCEDURE 1. Put the plastic on the table to prevent staining.
2. Weighing in the watch glass 15 g of potassium iodide (KI) and put them in the absorber.
3. Add the minimum amount of water needed to dissolve. Shake until dissolved completely.
4. Put on rubber gloves and measures 40 ml of 30% hydrogen peroxide in 100 ml graduated cylinder and pour into the cylinder of 250 ml.
5. Add about 20 ml of liquid detergent and removed (by swirling) until the hydrogen peroxide and detergent mix.
6. If you like, add a little coloring in some parts of the mouth of the specimen so that the leaves striped toothpaste.
7. Add the potassium iodide solution to the tube and hand away quickly. Stand back a little of the specimen.
8. You can bring a stick fire to the mouth of the tube and see what happens.
2H 2 O 2 (aq) -> 2H 2 O (l) + O 2 (g)
potassium iodide (KI) is a catalyst because it only increases the reaction rate is not spent as a reagent. However, a small part if it reacts, becoming iodine. The presence of iodine is shown by the brown color in parts of the product. The iodine stain. The reaction is performed in a graduated cylinder rather high, since the product formed vertically upwards and out quickly. That and its texture is called "toothpaste." As hydrogen peroxide is a very strong oxidizer must protect hands with gloves. In addition, the reaction is very fast, it is advisable to wear safety goggles. MATERIAL
graduated cylinder 250 ml, 100 ml graduated cylinder, glass clock, scales, gloves, safety glasses, protective plastic (optional), Chip (optional).
Products:
coloring (optional), liquid detergent (preferably white and pH = 7), hydrogen peroxide (H202) 30% potassium iodide (KI).
PROCEDURE 1. Put the plastic on the table to prevent staining.
2. Weighing in the watch glass 15 g of potassium iodide (KI) and put them in the absorber.
3. Add the minimum amount of water needed to dissolve. Shake until dissolved completely.
4. Put on rubber gloves and measures 40 ml of 30% hydrogen peroxide in 100 ml graduated cylinder and pour into the cylinder of 250 ml.
5. Add about 20 ml of liquid detergent and removed (by swirling) until the hydrogen peroxide and detergent mix.
6. If you like, add a little coloring in some parts of the mouth of the specimen so that the leaves striped toothpaste.
7. Add the potassium iodide solution to the tube and hand away quickly. Stand back a little of the specimen.
8. You can bring a stick fire to the mouth of the tube and see what happens.
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