"Reaction between Acids and Bases" PPT courseware

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"Reaction between Acids and Bases" PPT courseware

Part One Content: Classroom Experiment

Experiment 1: Reaction of sodium hydroxide solution with acid

1). In two test tubes containing a small amount of dilute sodium hydroxide solution, drop 1 drop of phenolphthalein test solution in each. The solution becomes ( ). Add dilute hydrochloric acid and dilute sulfuric acid dropwise to the two test tubes respectively while dripping. Oscillate until ( ) just disappears.

What does this mean about the change in the acidity and alkalinity of the solution?

become neutral

2) Use a dropper to absorb the reacted solution and drop it into an evaporating dish. Dry it on a low fire. What is left on the evaporating dish?

White crystals.

Chemical equation:

NaOH + HCl = NaCl + H2O

2NaOH + H2SO4 = Na2SO4 + 2H2O

in conclusion:

Bases react with acids to form salt and water.

General formula: base + acid = salt + water

Reaction between acid and base PPT, Part 2: Neutralization reaction:

1) Definition: The reaction in which a base reacts with an acid to form salt and water is called an acid-base reaction.

Judgment: MgO and H2SO4 react to produce MgSO4 and H2O (salt and water are produced). Is this reaction an acid-base reaction?

Answer: This is not an acid-base reaction, because an acid-base reaction should be a reaction in which an acid and a base react to form salt and water. We cannot just think that the products are salt and water, so this reaction is not an acid-base reaction.

2) Application of acid-base reaction:

In agriculture, hydrated lime "Ca(OH)2" is used to reduce the acidity of soil and achieve the purpose of improving acidic soil. In the petroleum industry, sodium hydroxide [NaOH] is used to neutralize excess sulfuric acid [H2SO4]; in medicine, aluminum hydroxide [Al(OH)3] is used to neutralize excess sulfuric acid. Too much stomach acid.

3) The essence of acid-base reaction:

The essence is that acid ionized H+ and alkali ionized OH- combine to form neutral water.

H＋＋OH－＝H2O

Reaction between acids and bases PPT, Part 3: Classroom exercises

1. Add 1 to 2 drops of phenolphthalein test solution to the sodium hydroxide solution, and then gradually drop in dilute hydrochloric acid until the reaction is completed. The color change of the solution during the entire process is ()

A. red → colorless → red

B. Red→Colorless→Colorless

C. Colorless → red → colorless

D. Colorless → blue → colorless

2. A certain solution can turn purple litmus test solution blue, then the solution can turn colorless phenolphthalein test solution ( )

A. Colorless b. Blue C. Purple D. red

3. In the tanning industry, hydrated lime [Ca(OH)2] is used to depilate fur, and the remaining hydrated lime is neutralized with hydrochloric acid. The chemical equation of this reaction is

Ca(OH)2+2HCl=CaCl2+2H2O

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, reaction between acids and bases PPT download, .PPT format;

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"Reaction between Acids and Bases" PPT:

"Reaction between Acids and Bases" PPT Part One Content: Learning Objectives: 1. Find evidence of the reaction between acids and bases through independent exploration; 2. Give examples of the applications of acid-base reactions in life. Scenarios and questions raised Acid is acidic, with pH <7, and can make purple...

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Update Time: 2024-10-12

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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