"Several Common Bases" Acids and Bases PPT Courseware 3

Description

"Several Common Bases" Acids and Bases PPT Courseware 3

chemical properties of acids

①Acid and acid-base indicators

②Acid + Metal = Salt + H2↑

③Acid + metal oxide = salt + H2O

④Acid + alkali

⑤Acid + carbonate = salt + H2O + CO2↑

alkaline in life

Detergents such as preserved eggs and liquid soap have a greasy and astringent taste.

These substances contain a special class of compounds

compound composed of metal ions and hydroxide ions

common bases

Sodium hydroxide, calcium hydroxide

Potassium hydroxide, ammonia

1.Physical properties of NaOH

Commonly known as: fire soda, caustic soda, caustic soda

(1) White solid, easily soluble in water, and releases a lot of heat when dissolved.

(2) Strongly corrosive.

(3) Easy to absorb water and deliquesce - used as desiccant

②Can react with non-metal oxides

Ca(OH)2+CO2=CaCO3↓+H2O

Reasons for sealed storage of solid sodium hydroxide:

Sodium hydroxide easily absorbs moisture in the air and deliquesces, and reacts with carbon dioxide in the air and deteriorates.

2NaOH +CO2 == Na2CO3 + H2O

(3) NaOH can react with salt solution:

2NaOH + CuSO4==Cu(OH)2↓+ Na2SO4

How to identify limewater and sodium hydroxide solution?

1. Pour in CO2: Take a small amount of colorless liquid into two test tubes, and pass in CO2 respectively. The one that becomes turbid is lime water, and the one that is calm is NaOH solution.

2. Add Na2CO3 solution: Put a small amount of colorless liquid into two test tubes, and add Na2CO3 solution dropwise respectively. If there is white precipitate, it is lime water, and if there is no phenomenon, it is NaOH solution.

practise

When a mixed gas consisting of SO2, O2, H2, CO2, and H2O passes through the NaOH solid, what is the remaining gas?

The final remaining gases are: O2, H2.

NaOH can dry neutral gases such as O2 and H2, but cannot dry acidic gases such as SO2, CO2 and HCl.

Class exercises

If solid sodium hydroxide is exposed to the air for a long time, its mass will _______, and it will _______.

Take a small amount of solid in a test tube and add enough dilute hydrochloric acid. If bubbles appear, it means it has deteriorated; otherwise, it has not deteriorated.

2NaOH + CO2==Na2CO3 + H2O

Na2CO3 + 2HCl==2NaCl+ H2O + CO2↑

Take a small amount of solid in a test tube, add enough water to dissolve it, and then add an appropriate amount of lime water. If a white precipitate forms, it will deteriorate. Otherwise, it will not deteriorate.

1. After placing ① concentrated hydrochloric acid, ② solid caustic soda, ③ salt water and ④ concentrated sulfuric acid in the air for a period of time, the mass will increase significantly.

A.①④ B.②④ C.①③ D.②③

2. Among the following gases, which one can be dried with either concentrated sulfuric acid or NaOH solid

A.SO2 B.H2 C.CO2 D.NH3

3. The sodium hydroxide solid has been exposed to the air for a long time, and the surface has become moist. After sufficient drying, the mass of the solid will

A. Increase B. Decrease C. No change D. Unable to determine

Keywords: Acids and Bases teaching courseware, several common bases teaching courseware, Beijing curriculum reform version 9th grade chemistry PPT courseware download volume 2, 9th grade chemistry slide courseware download, Acids and Bases PPT courseware download, several common bases PPT courseware download, .PPT format;

For more information about the PPT courseware "Acides and Bases: Several Common Bases", please click on the Acids and Bases ppt: Several Common Bases ppt tag.

"Several Common Bases" Acids and Bases PPT Courseware 4:

"Several Common Bases" Acids and Bases PPT Courseware 4 Knowledge Review Knowledge Point 1 Physical properties of sodium hydroxide and calcium hydroxide Sodium hydroxide: white solid, ____ dissolves in water and releases a lot of heat. Easily absorbs moisture and is highly corrosive. Calcium hydroxide: white...

"Several Common Bases" Acids and Bases PPT Courseware 2:

"Several Common Bases" Acids and Bases PPT Courseware 2 Review before class: Acid: A compound in which all cations produced during ionization are hydrogen ions (H+). Such as HCl, H2SO4, HNO3, H2CO3 Alkali: All the anions produced during ionization are compounds of hydroxide ions (OH-). ..

"Several Common Bases" Acids and Bases PPT Courseware:

"Several Common Bases" Acids and Bases PPT courseware to review the chemical properties of acids 1. Indicator Purple litmus solution turns red Colorless phenolphthalein solution does not change color 2. Active metals: react to generate salts and hydrogen 3. With carbonates: generate salts, water, and carbon dioxide 4. Oxidize with metals...

File Info

Update Time: 2024-10-02

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

Preview