"Iron Salts and Ferrous Salts" Iron and its compounds PPT

Description

"Iron Salts and Ferrous Salts" Iron and its compounds PPT

Part One Content: Establishment of Necessary Knowledge and Qualifications

1. Inspection of Fe2+ and Fe3+

【Smart Judgment】

(1) Use acidic KMnO4 solution to check whether the FeCl3 solution contains FeCl2 ()

Tip:×. Cl- can also discolor acidic KMnO4 solution.

(2) To check whether the green vitriol crystal (FeSO4·7H2O) has been oxidized and deteriorated, you can dissolve the green vitriol crystal in dilute sulfuric acid and add KSCN solution dropwise, and then observe whether the solution turns red ()

Tips:√. If the green vitriol deteriorates, Fe3+ will be generated, and the KSCN solution will turn red when added dropwise.

【Situation·Thinking】

The chemistry teacher demonstrated a "blood handprint" magic trick in class. Spray KSCN solution on your hands in advance, then print on white paper and let dry. Spray the white paper with FeCl3 solution, and red blood fingerprints will appear immediately on the white paper.

What is the relationship between this phenomenon and the properties of FeCl3? What is its use?

Tip: This magic uses the combination of Fe3+ and SCN- to generate red Fe(SCN)3. This phenomenon can be used to test Fe3+.

2. Conversion of Fe2+ and Fe3+

1. Experiments and phenomena

2. Ionic equation of reaction

3.Conclusion

【Situation·Thinking】

The manufacturing process of industrial printed circuit boards is shown in the figure, in which the solution FeCl3 is used for "etching".

(1) What is the principle of etching printed copper plates with FeCl3 solution?

Tip: 2Fe3++Cu====2Fe2++Cu2+.

(2) Fe or FeCl3 is produced from FeCl2. Can you write its chemical equation?

Tip: FeCl2+Zn====ZnCl2+Fe,2FeCl2+Cl2====2FeCl3.

(3) What metal ions are contained in the "etching liquid" after the reaction? If Cu and FeCl3 are to be recovered, how should a recovery plan be designed?

Tip: The "etching liquid" after the reaction contains metal ions such as Fe3+, Fe2+, and Cu2+. In order to extract Cu from the solution, excess iron powder should be added to the solution: Fe+Cu2+====Fe2++Cu, Fe+2Fe3+=3Fe2+; then use hydrochloric acid

Dissolve excess iron powder: Fe+2HCl====FeCl2+H2↑; after filtering, obtain Cu, then add fresh chlorine water to the filtrate to obtain FeCl3:2FeCl2+Cl2====2FeCl3.

Iron salt and ferrous salt PPT, part 2 content: Key capabilities and literacy formation

Knowledge point 1: Mutual transformation of Fe2+, Fe3+ and Fe - "Iron Triangle"

[Key points to clarify doubts]

1.Fe only has reducing properties and can be oxidized to Fe2+ and Fe3+ by oxidants.

Such as: Fe+S FeS, Fe+2Fe3+====3Fe2+, Fe+Cu2+====Cu+Fe2+;

2Fe+3Cl2 2FeCl3,3Fe+4H2O(g) Fe3O4+4H2.

2.Fe2+ has both oxidizing and reducing properties

Such as: 2Fe2++Cl2====2Fe3++2Cl-, Zn+Fe2+====Zn2++Fe,

FeO+CO Fe+CO2.

3.Fe3+ has strong oxidizing property and can be reduced to Fe2+ or Fe

Such as: 2Fe3++Cu====2Fe2++Cu2+,

Fe2O3+3CO 2Fe+3CO2,

Fe2O3+2Al 2Fe+Al2O3.

【Think·Discussion】

(1) How to remove FeCl2 impurities contained in FeCl3 solution using conversion analysis between ions?

Tip: Add enough chlorine water or H2O2 or pass in enough Cl2 into the mixed solution.

(2) Based on the analysis of the properties of Fe2+, how should the ferrous salt solution be stored in the laboratory?

Tip: Add iron powder to the ferrous salt solution to prevent Fe2+ from being oxidized.

Knowledge point 2: Testing of Fe3+ and Fe2+

[Key points to clarify doubts]

1. Use KSCN solution and chlorine water

2. Use NaOH solution

3. Inspection of Fe3+ and Fe2+ in mixed solutions containing Fe2+ and Fe3+

【Think·Discussion】

How to prove whether a solution containing Fe3+ contains Fe2+?

Tip: Since the solution contains Fe3+, neither NaOH solution nor KSCN solution can prove whether the solution contains Fe2+; you can use the reducing property of Fe2+ to add acidic KMnO4 solution to the solution. The purple-red color of the solution will fade, proving that the solution contains Fe2+.

【Case Demonstration】

[Typical example] In order to check whether a bottle of iron supplement medicine (main component is FeSO4) at home has deteriorated, a classmate consulted relevant information and learned that Fe2+ can be oxidized by acidic potassium permanganate solution and cause the potassium permanganate solution to fade. And combined with the knowledge already learned, the following experiments were designed:

Remove the sugar coating from the tablets and grind them finely, dissolve and filter, add the filtrate to two test tubes, drop acidic potassium permanganate solution into one test tube, and drop KSCN solution into the other test tube. Please fill in the name of the student who was exposed during the experiment

The conclusions that should be drawn when the following phenomena occur:

(1) ① If the color fades after adding acidic potassium permanganate solution and does not turn red after adding KSCN solution, what conclusion can be drawn?

②What phenomenon will be observed if chlorine water is added dropwise to the solution obtained in ①?

(2) If the acidic potassium permanganate solution does not fade after being dropped, but the KSCN solution turns red after being dropped, what conclusion can be drawn?

(3) ① If the acidic potassium permanganate solution fades after being dropped, and the KSCN solution turns red after being dropped, what conclusion can be drawn?

② In the case of ①, drop an appropriate amount of sodium hydroxide solution into one of the test tubes. Can the phenomenon prove that the filtrate contains Fe2+?

(4) Can KMnO4 solution and KSCN solution be dropped into the same test tube for verification? Why? Please explain.

Iron salt and ferrous salt PPT, the third part of the content: knowledge correlation·literacy application

【Core Integration】

1. Two-dimensional valence state diagram of iron element

2. Example analysis

(1) The chemical equation of transformation ① in the two-dimensional valence state diagram of iron element:

____________________________, the phenomenon in which this transformation process occurs in solution is ____________________________________________.

(2) Fe(OH)3 is easy to decompose when heated. Write the chemical equation for transformation ②: ____________________.

(3) Converting Fe2+ to Fe3+ requires the addition of _______, and converting Fe3+ to Fe2+ requires the addition of _______ (fill in "oxidizing agent" or "reducing agent").

Keywords: Free download of the PPT courseware for high school chemistry compulsory course 1 from the People's Education Press, PPT download of iron salts and ferrous salts, PPT download of iron and its compounds, .PPT format;

For more information about the PPT courseware "Iron and its Compounds Iron Salts and Ferrous Salts", please click on the Iron and Its Compounds ppt Iron Salts and Ferrous Salts ppt tag.

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Update Time: 2024-09-07

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