Question

Why is it necessary to perform the reaction of Fe with S8 solution under a fume

REAC 422 Saying Chemical Reaction and Writing Chemica ls 1111 Pre-Laboratory Assignment 1. Briefly answer the following questions about some of the procedures you will be using in this experiment. (1) Why would it be dangerous to perform Part 1 of the procedure of this experiment close to a lighted Bunsen burner? (4) Although the crucible is covered while heating in Part Ill of this experiment, why should you heat an uncovered orucible in Part VI? (5) Why is it important to wash your hands before leaving the laboratory? (2) Why is it necessary to perform the reaction of Fe with Sg solution under a fume hood? 2. Briefly explain what is meant by each of the follow- ing terms as it relates to this experiment. (1) precipitation reaction (3) What solutions are used in Part II of the Pro- cedure? Briefly describe the hazards associated with each of these solutions. (2) spectator ion

Answer 1

The reaction occurring here is: Fe + S₈ = 8 FeS

But during the heating of the reactants in a test tube on a bunsen burner, the sulfur (S₈) may catch fire above 160 ^oC and form SO₂ gas (sulfur dioxide).

S₈ + O₂ = 8 SO₂ (gas)

This SO₂ gas is highly toxic when inhaled and corrosive when comes in contact with the skin and the eyes. When inhaled, it can cause asthma attack, and even death by pulmonary edema (breathing issue due to accumulation of excess liquid in the air sacs in lung.) When it comes in contact with skin or the eyes it may permanently burn the area and cause blindness (when comes in contact with eyes).

Again the fine powder Fe can also irritate the eyes, skin and respiratory tract (if inhaled) and may cause pneumoconiosis disease. These are the reasons why the heating must be carried out inside a fume hood, otherwise these toxic gas and fine particles would cause damage to the one carrying out the experiment.