1. What would be a good hypothesis for this lab? 2. Why do you think the tempera
ID: 949671 • Letter: 1
Question
1. What would be a good hypothesis for this lab?
2. Why do you think the temperature of the reaction increased as the reaction proceeded?
Here is my Lab and the results:
Oxidation of Fe2+to Fe3+ 9. Measure and pour 150mL of 3% hydrogen peroxide(H2O2) into the clean 600mL beaker. 10. Use a weigh boat and scale to measure and transfer approximately 3g cream of tartar(KC4HsOs) into the 600mL beaker. 11. Stir the solution with the stir rod until the cream of tartar is evenly distributed throughout the hydrogen peroxide 12. Place the thermometer in the iron acetate solution in the flask and record the initial temperature (Time = 0) in Table 3. 13. Observe and record the color of the iron acetate solution (prepared in Part 1) in Table 3. (1 g of steel wool & 4.5% Acetic Acid, C2H40) 14. Add 15 mL of the iron acetate solution from the flask to the 600 mL beaker. Record the temperature and color of the solution in Table 3 every ten seconds for two minutes; or, until you see a color change take place. You will see a marked increase in temperature as the reaction proceeds. Gently stir the solution as the reaction proceeds. Bubbles should form as carbon dioxide is released.Explanation / Answer
In the experminent Iron acetate is formed by using steel wool and acetic acid. During this reaction when one left steel wool in vinegar, iron reacted with acetic acid to produce ferrous acetate and hydrogen.
Fe + 2[CH3COOH] ----> Fe(CH3COO)2 + H2
The so produced nascent hydrogen is very strong reducing agent and it reduced the earlier formed brown ferric acetate due to the presence of H2O2 to ferrous acetate. This explains the loss of reddish brown colour.
Iron(ii) acetate by adding hydrogen peroxide which is an even more powerful oxidizer than oxygen in the air. The result is ferric iron(iii) acetate.
Fe + 2[CH3COOH] ----> Fe(CH3COO)2 + H2
The temperature inside the beaker gradually rises.When one soak the steel wool in vinegar it removes the protective coating of the steel wool and allows the iron in the steel to rust. Rusting (or oxidation) is a chemical reaction between iron and oxygen, this chemical reaction creates heat energy which increases the temperature inside the beaker. This experiment is an example of an exothermic reaction, a chemical reaction that releases energy in the form of heat.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.