"Reaction between Acids and Bases" PPT

Description

"Reaction between Acids and Bases" PPT

Part One Content: Learning Objectives:

1. Find evidence of reactions between acids and bases through independent exploration;

2. Give examples of applications of acid-base reactions in daily life.

Scenarios and questions raised

Acid is acidic, with a pH of <7, and can make the purple litmus test solution turn ___ color.

Alkali is alkaline, with pH > 7, and can make purple litmus test solution change ___ color.

What would happen if a reaction occurred between an acid and a base?

PPT on the reaction between acids and bases, part 2: thinking and discussion

1. What role does phenolphthalein play in the experiment? Are there any other ways to achieve a similar effect?

Phenolphthalein serves as an indicator. According to the change of phenolphthalein test solution from red to colorless, it can be judged whether the reaction of NaOH and HCl is complete.

You can also use purple litmus test solution to judge that the reaction is just complete.

2. Why must dilute hydrochloric acid be added drop by drop during operation?

Prevent excessive addition of dilute hydrochloric acid.

3. Is the substance on the glass piece still sodium hydroxide? Why?

No, because the sodium hydroxide has completely reacted. The phenolphthalein test solution has changed from red to colorless.

PPT on the reaction between acids and bases, part 3: step-by-step learning

1. Acid-base reaction

1.Definition

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

2.Essence

The hydrogen ions in the acid combine with the hydroxyl ions in the base to form water.

2. Application of acid-base reaction

1. In agriculture, the method of applying slaked lime (mainly containing Ca(OH)2) is used to reduce the acidity of the soil.

2. Use alkali to treat acidic industrial wastewater

3. When refining petroleum, use sodium hydroxide to neutralize excess acid.

4. Use aluminum hydroxide to neutralize excess acid in the stomach.

3. Determination of soil acidity and alkalinity

[Experimental goal]

1. Preliminarily learn the methods of soil sampling and testing.

2. Learn to use pH test paper to measure soil pH.

3. Understand the importance of protecting soil resources and put forward suggestions for improving soil acidity and alkalinity.

【experiment equipment】

Wooden sticks, waste newspapers, glass rods, test tubes, distilled water, pH test paper (precision pH test paper and color comparison card), window screen (or metal screen), cloth bag.

Reaction between acids and bases PPT, Part 4: After-class exercises

1. Fully dilute a certain amount of hydrochloric acid with water, and the pH of the resulting solution ( )

A. Must be equal to 7 B. Must be greater than 7

C. Must be less than 7 D. Must be equal to 0

2. Some countries are trying carbonated water to water certain plants, and its function is ( )

A. Adjust soil pH and improve acidic soil

B. Adjust soil pH and improve alkaline soil

C. Promote photosynthesis of plants

D. Create a greenhouse above the plants

3. Generally, _______ is used to neutralize acidic soil, and its chemical formula is _________

4. Which of the following statements is correct---- ( )

A. Compounds that can ionize to OH- are not necessarily bases.

B. Purple litmus test solution can turn acid solution red

C. Anything with a pH value greater than 7 must be an alkaline solution

D. The reactions that produce salt and water are all acid-base reactions.

5. There are two bottles of colorless solutions without labels in the laboratory. It is known that one of them is a hydrochloric acid solution and the other is a sodium hydroxide solution. What methods can you use to distinguish the two?

1). Use acid-base indicators, pH test paper, and pH meter to detect.

2). Utilize the reaction of sodium carbonate, calcium carbonate and hydrochloric acid solution to generate gas detection.

3). Use ferric chloride, copper chloride and sodium hydroxide solution to react to produce precipitation.

4). Detect by heating and evaporating to see if there are any remaining crystals.

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 courseware:

"Reaction between Acids and Bases" PPT Courseware Part One Content: Classroom Experiment Experiment 1: Reaction of sodium hydroxide solution and acid 1) In two test tubes containing a small amount of dilute sodium hydroxide solution, drop into each 1 drop of phenolphthalein test solution, the solution changes to ( ), add 2 drops respectively..

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Update Time: 2024-07-06

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

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