Materials & Pre-Demo Preparations:
3 g dextrose
5 g sodium hydroxide pellets
5-10 ml indigo carmine indicator solution, (1% solution - 1 g per 100 ml water)
250 ml distilled water
500 ml round-bottom flask
stopper
stirring rod
Before the demonstration, dissolve 3 g of dextrose and 5 g of sodium hydroxide in 250 ml distilled water. After adding the indigo carmine indicator, the solution needs to sit for at least 10 minutes before you can begin the demonstration.
Directions: In a beaker containing 250 ml of distilled water, add 3 g of dextrose and stir until it dissolves. Next, add 5 g of sodium hydroxide pellets into the same beaker, and use a stirring rod to break apart the pellets so that they will dissolve quickly. Once this is done, pour the contents of the beaker into the glass flask, and add between 5-10 ml of the indigo carmine indicator. Enough should be added to the solution so that it turns a yellow color. Put the stopper in the flask, and let it sit for ten minutes. After ten minutes, the solution should be ready for the demonstration. Shake the flask once or twice, and it should turn a red color. Shake once or twice again, and it should turn green. Then, if it sits, it should turn back to the yellow color.
วิธีทำตามนี้อะครับ ในส่วนผสมเขาบอกให้ใช้อินดิโกคาร์มีน แต่ที่รร.ผมไม่มี มีแต่อะซีโตคาร์มีน ไม่ทราบว่าจะใช้แทนกันได้มั้ยครับ
Aceto-Carmine ใช้แทน Indigo Carmine ในปฏิกิริยา Traffic Light ได้มั้ยครับ?
3 g dextrose
5 g sodium hydroxide pellets
5-10 ml indigo carmine indicator solution, (1% solution - 1 g per 100 ml water)
250 ml distilled water
500 ml round-bottom flask
stopper
stirring rod
Before the demonstration, dissolve 3 g of dextrose and 5 g of sodium hydroxide in 250 ml distilled water. After adding the indigo carmine indicator, the solution needs to sit for at least 10 minutes before you can begin the demonstration.
Directions: In a beaker containing 250 ml of distilled water, add 3 g of dextrose and stir until it dissolves. Next, add 5 g of sodium hydroxide pellets into the same beaker, and use a stirring rod to break apart the pellets so that they will dissolve quickly. Once this is done, pour the contents of the beaker into the glass flask, and add between 5-10 ml of the indigo carmine indicator. Enough should be added to the solution so that it turns a yellow color. Put the stopper in the flask, and let it sit for ten minutes. After ten minutes, the solution should be ready for the demonstration. Shake the flask once or twice, and it should turn a red color. Shake once or twice again, and it should turn green. Then, if it sits, it should turn back to the yellow color.
วิธีทำตามนี้อะครับ ในส่วนผสมเขาบอกให้ใช้อินดิโกคาร์มีน แต่ที่รร.ผมไม่มี มีแต่อะซีโตคาร์มีน ไม่ทราบว่าจะใช้แทนกันได้มั้ยครับ