"Sodium carbonate and sodium bicarbonate flame reaction" Sodium and its compounds PPT

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"Sodium carbonate and sodium bicarbonate flame reaction" Sodium and its compounds PPT

Part One: Goals and Competencies:

1. Explore the similarities and differences in the properties of sodium carbonate and sodium bicarbonate through chemical experiments, and become familiar with their applications. (scientific inquiry)

2. Understand the experimental operation of flame color reaction, and identify K+, Na+, etc. based on flame color reaction. (scientific inquiry)

PPT on the flame color reaction of sodium carbonate and sodium bicarbonate, part 2: independent preview to explore new knowledge

1. Sodium carbonate and sodium bicarbonate

1. Experiment to explore the solubility of Na2CO3 and NaHCO3 and the acidity and alkalinity of the solution

2. Experiment to explore the thermal stability of Na2CO3 and NaHCO3

3. Reaction of Na2CO3, NaHCO3 with acid and alkali

(1) React with acid (sufficient hydrochloric acid) (write the corresponding ionic equation)

①Na2CO3: ____________________.

②NaHCO3: ____________________________.

(2) Reaction with alkali (sodium hydroxide) (write the corresponding chemical equation)

①Na2CO3 does not react with NaOH.

②NaHCO3:_______________________________.

How to remove a small amount of NaHCO3 from Na2CO3 solid? How to remove a small amount of Na2CO3 in NaHCO3 solution?

[Tips]Heat the mixture until no gas is produced. The reaction equation is: 2NaHCO3======△　Na2CO3＋CO2↑＋H2O.

By passing CO2 into the NaHCO3 solution, a small amount of Na2CO3 can be removed. The reaction equation is: Na2CO3+H2O+CO2===2NaHCO3.

2. Flame reaction

1. operate

2. Flame colors of several metals

Does the flame reaction show the chemical properties of ions? Why is platinum wire used as the carrier for flame reaction? Can other materials be used instead of platinum wire?

[Tips] The flame reaction shows the properties of elements, which are physical properties. Because the flame of platinum wire has no special color when burning, platinum wire is often used as the carrier of flame color reaction. Other metals, such as smooth and rust-free iron wire or nickel, chromium, tungsten wire, etc., also have no special color of flame when burning, and can also be used. Used as a carrier for flame reaction.

Sodium carbonate and sodium bicarbonate flame reaction PPT, the third part: core breakthrough and difficult difficulties

Identification and impurity removal of sodium carbonate and sodium bicarbonate

1. How to identify sodium carbonate and sodium bicarbonate

2. Impurity removal of Na2CO3 and NaHCO3 mixtures

Mixture (impurities in brackets) Impurity removal methods and reagents

Na2CO3 solid (NaHCO3) is heated to constant weight

Pass sufficient CO2 gas into NaHCO3 solution (Na2CO3)

Add appropriate amount of NaOH solution to Na2CO3 solution (NaHCO3)

3. Use the idea of ​​combining numbers and shapes to understand the reaction between sodium carbonate, sodium bicarbonate and hydrochloric acid

HCl (a small amount) + Na2CO3===NaCl + NaHCO3;

2HCl (enough amount) + Na2CO3 = = 2NaCl + CO2 ↑ + H2O;

HCl＋NaHCO3===NaCl＋CO2↑＋H2O.

(1) Add hydrochloric acid dropwise to the Na2CO3 solution. The relationship between the volume of hydrochloric acid consumed and the volume of CO2 produced is as shown in Figure A.

(2) Add hydrochloric acid dropwise to the NaHCO3 solution. The relationship between the volume of hydrochloric acid consumed and the volume of CO2 produced is shown in Figure B.

Sodium carbonate and sodium bicarbonate flame reaction PPT, part 4 content: meeting standards in class and improving quality

1. In the following comparison between Na2CO3 and NaHCO3, which one is correct ()

A. Sodium bicarbonate is more thermally stable than sodium carbonate

B． Solutions of two substances can be identified using clear limewater

C． Sufficient amounts of Na2CO3 and NaHCO3 react with equal amounts of hydrochloric acid, and the latter produces more CO2

D． When equal masses of Na2CO3 and NaHCO3 react with sufficient amounts of hydrochloric acid, the former produces more CO2

C: Sodium bicarbonate decomposes when heated, and sodium carbonate is stable when heated. A is incorrect; adding calcium hydroxide solution to sodium carbonate and sodium bicarbonate solutions will produce calcium carbonate precipitates, which cannot be identified. B is incorrect; excessive sodium carbonate and When reacting with hydrochloric acid, sodium bicarbonate is actually obtained, and no gas is generated at all. However, the reaction between hydrochloric acid and sodium bicarbonate must produce carbon dioxide. C is correct; equal masses of Na2CO3 and NaHCO3 react with sufficient amounts of hydrochloric acid, and the latter produces more CO2. , D error. ]

2. There are two bottles of colorless solution without labels, containing Na2CO3 solution and NaHCO3 solution respectively. The following reagents or methods can be used to distinguish the two ()

①Ca(OH)2　②Hydrochloric acid　③CaCl2　④NaOH　⑤Heating

A. ①③B. ①④

C． ②③ D. ②⑤

C　①④ are both alkalis. When added to Na2CO3 and NaHCO3, the phenomena are the same (① all have precipitation, and ④ have no obvious phenomenon), so ①④ cannot be distinguished. ② Add hydrochloric acid to Na2CO3 solution and NaHCO3 solution. The NaHCO3 solution produces bubbles at a faster rate, and the Na2CO3 solution produces bubbles at a slower rate. They can be distinguished. ③When CaCl2 is added, there is precipitation in the Na2CO3 solution, but no precipitation is formed in the NaHCO3 solution, which can be distinguished. ⑤Heating method, because both are solutions and do not decompose when heated, so they cannot be distinguished. ]

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For more information about the PPT courseware "Sodium and its Compounds Sodium Carbonate and Sodium Bicarbonate Flame Reaction", please click on the Sodium and its Compounds ppt Sodium Carbonate and Sodium Bicarbonate Flame Reaction ppt tag.

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Update Time: 2024-11-20

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