1. OBJECTIVE
This experiment deals with identifying the presence of some metallic ions, based on the characteristic emission spectrum for each element. The experiment, based on the Rutherford-Bohr atomic model, makes knowledge clearer about phenomena involving atomic layers, electronic transition, among others.


At the end of this experiment you should be able to:

use the Bunsen burner;

use the fume hood;

identify cations through the emission spectrum;

relate light emission to the Rutherford-Bohr atomic model.

2. WHERE TO USE THESE CONCEPTS?
Flame test analysis is a procedure widely used in chemistry laboratories. In addition to helping to understand the Rutherford-Bohr atomic model, the practice can be used for colorimetric observation to identify the presence of metal cations in different substances.


3. THE EXPERIMENT
This experiment uses the following items: fume hood, Bunsen burner and spray bottles containing saline solutions. During the experiment you will identify and differentiate oxidizing and reducing flames, in addition to visualizing the effect of the presence of metallic cations on the flame emitted by the Bunsen burner.


4. SECURITY
In this practice, gloves, lab coat, mask and glasses will be used. Despite the experiment being carried out in the fume hood, personal protective equipment is essential for the laboratory environment. The glove will prevent any possible cuts or contamination with agents harmful to the skin, the lab coat will protect the body as a whole, the mask will prevent the aspiration of likely droplets emitted by the solution and the glasses will prevent contamination of the eyes.


5. SCENARIO
The experiment will be conducted in the fume hood. You will use a Bunsen burner to produce a flame. Spray bottles containing different metallic salt solutions are stored in the chapel closet. You must select and use them to ensure the correct execution of the experiment.