"Preliminary Understanding of Acids and Bases" Acids and Bases PPT Courseware

Description

"Preliminary Understanding of Acids and Bases" Acids and Bases PPT Courseware

think

As far as you know, what substance can turn purple litmus red?

What are the uses of purple litmus reagent?

1. Acid-base indicator

1. Purple litmus reagent:

Acidic substances turn purple litmus reagent red;

Alkaline substances turn purple litmus reagent blue.

2. Colorless phenolphthalein reagent:

Can acidic substances change color of colorless phenolphthalein reagent?

Alkaline substances turn the colorless phenolphthalein reagent red.

2. Acid and alkali salts

【think】

According to experiments, what substance can turn purple litmus red?

According to experiments, what substance can turn purple litmus blue?

According to experiments, what substance can turn colorless phenolphthalein red?

What are the common characteristics?

HCl, H2SO4 and HAc can turn purple litmus red

Ca(OH)2 and NaOH can turn purple litmus blue and colorless phenolphthalein red.

1. Definition

Acid: A compound containing hydrogen and an acid radical.

Base: A compound containing a metallic element and hydroxide.

Salt: A compound containing a metal cation (or ammonium ion) and an acid radical.

2. Judgment tips for acid, alkali and salt

Acid starts with "hydrogen" and ends with "acid root" HCl, H2SO4, HNO3, H2CO3...

Alkali "metal" head, "hydroxide" tail NaOH, Ca(OH)2, KOH, Cu(OH)2, Fe(OH)3...

The "metal" head of the salt and the "acid root" tail are NaCl, Na2CO3, NaHCO3, CaCO3, NH4Cl...

"Ammonium root" head, "acid root" tail

【practise】

A.NaOH B.HCl C.CuSO4 D.H2SO4

E, Na2CO3 F, K2SO4 G, BaCl2 H, KNO3

I, CaCl2 J, NaHCO3 K, NH4NO3 L, H2CO3

M, MgCl2 N, Fe(OH)2 O, (NH4)2SO4 P, Cu(OH)2

Which of the above substances is an acid ( )

Which is a base? ( )

What belongs to salt is ( )

3. The pH of the solution (PH)

[Method for measuring pH]

Place a small piece of PH test paper on a white porcelain plate, dip a clean and dry glass rod into a drop of the liquid to be tested, and drop it on the PH test paper. Observe the change in color of the test paper and compare with a color card.

Determine the pH of hydrochloric acid, sodium hydroxide solution, and sodium chloride solution

4. Exploration - 1 Particles that turn purple litmus red

[Ask a question] Hydrochloric acid can turn purple litmus red. What particles make purple litmus red?

[Check the materials] The sodium chloride solution contains three particles: Na+, Cl-, and H2O.

Hydrochloric acid is an aqueous solution of hydrogen chloride gas. There are three types of particles in hydrochloric acid: H+, Cl-, and H2O.

4. Exploration - 2 Particles That Turn Purple Litmus Blue

[Ask a question] Sodium hydroxide can turn purple litmus blue. What particles make purple litmus blue?

[Check the materials] The sodium chloride solution contains three particles: Na+, Cl-, and H2O.

Sodium hydroxide solution and calcium hydroxide solution can turn purple litmus blue.

There are three types of particles in sodium hydroxide solution: Na+, OH-, and H2O.

Hydroxide ions turn purple litmus reagent blue

Water, sodium chloride solution, purple litmus reagent

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For more information about the PPT courseware "Acids and Bases: Preliminary Understanding of Acids and Bases", please click on the Acids and Bases ppt: Preliminary Understanding of Acids and Bases ppt tag.

"Preliminary Understanding of Acids and Bases" Acids and Bases PPT Courseware 2:

"Preliminary Understanding of Acids and Bases" Acids and Bases PPT Courseware 2 Knowledge Review Knowledge Point 1 Acid-base Indicators [ Notes ] ① When the indicator encounters an acidic solution or an alkaline solution, it is the indicator that changes color , rather than acidic or alkaline solutions. ②According to the change of indicator color..

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Update Time: 2024-10-19

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 2 industry PPT template

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