Semáforo Quimico. Experimento. Reacción Redox

Introduction

In this video, the presenter demonstrates how indigo carmine can act as a pH and redox indicator. The experiment involves adding sodium hydroxide and glucose to indigo carmine solution in separate glasses, then mixing them together in a flask to observe color changes.

Adding Sodium Hydroxide and Glucose

• Add sodium hydroxide (caustic soda) to one glass.

• Add glucose (dextrose) to another glass.

• Add warm water to both glasses.

• Shake both glasses well.

Adding Indigo Carmine Solution

• Add a few drops of indigo carmine solution to the glass with glucose.

• Observe the blue coloration of the indigo carmine.

Mixing Solutions in Flask

• Transfer contents of both glasses into a flask.

• Close the flask tightly and shake it well.

Observing Color Changes

• Observe how the color changes from green to red and yellow as air enters the flask, creating an oxidant environment stronger than the glucose reducing environment.

• Red lasts very little, which is the intermediate state, before turning yellow again in its reduced state.

Conclusion

The presenter concludes by demonstrating how oxygen can be used instead of shaking the flask to create an oxidant environment that turns indigo carmine green.

Using Oxygen Instead of Shaking Flask

• Use oxygen from welding equipment instead of shaking flask.

• Observe how it turns from red to green.

Final Remarks

• The experiment demonstrates how indigo carmine can act as a pH and redox indicator, with its color changing depending on the presence of reducing or oxidizing agents.

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