Reaction of calcium oxide and carbon dioxide

When learned the properties of alkaline oxide and acidic oxides in the junior middle school chemistry, we all wanted to see the phenomenon of the interaction between them. But because of the experiment is too difficult, we were often told not to do it in teaching. Both the teachers and students feel very sorry for that.

After repeated experiments, I have solved this problem; the operating processes of the experiment are as follows:

1. Experiment supplies

Two Penicillin bottles with plug, one medical large needle, a small balloon bag, 2 rubber droppers, a little fresh calcium oxide (CAS NO: 1305-78-8), and a little amount of dilute hydrochloric acid, clarification of calcium oxide water.

2. The experimental process

(1)   Crushing the fresh calcium oxide into powdered form, and then packing 1 gram calcium oxide powder into the penicillin bottle, and filled with carbon dioxide gas, quickly with rubber plug sealing.

(2) Full fill the balloon bag with carbon dioxide gas, binding the large needle in the mouth of balloon bag, inserted it to the penicillin bottle quickly, and shake the penicillin bottle gently, so that the carbon dioxide and calcium oxide can full contact, and then placed it on the desktop.

3. Analyzing the experimental phenomena

(1)   The balloon bag filled with carbon dioxide was gradually fade in the experiment, it means that the internal pressure of penicillin bottle decrease, it proves that chemical reactions occurred in the bottle, to reduce the carbon dioxide gas in the bottle.

(2)   Adding dilute hydrochloric acid to the reaction of penicillin bottle of A and another containing penicillin bottle of B calcium oxide, respectively, and map 1b device quickly plug sealing filled with rubber dropper clear calcium oxide water, and oscillation of penicillin bottle, and gently squeeze the rubber head tube of calcium oxide water, control of calcium oxide water droplets do not fall in the penicillin bottle, and moved up and down in the burette, the calcium oxide water dropper bottle without changes in B, indicating no carbon dioxide gas produced. The bottle A dropper in calcium oxide water are slightly cloudy phenomenon, it proved that the calcium carbonate A bottle, which is composed of calcium oxide and carbon dioxide reaction to come, it produces and dilute hydrochloric acid reaction of carbon dioxide gas, so that the dropper of calcium oxide water turbid.

The experiment has the advantages of simple operation, obvious phenomenon, it is suitable for teacher's demonstration experiment in the class, but also adapt to the student experiment.

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Calcium oxide risks

Calcium oxide is a kind of chemical compounds with the Chemical formula CaO. It is a colorless, cubic crystalline or white amorphous substance. Calcium oxide has many aliases, we often call it lime, quicklime, or caustic lime, its CAS No is 1305-78-8. In this article, we will tall about some risks of Calcium oxide and some measures as well.

Here are the lists of Potential Health Effects:

Inhalation of Calcium oxide is highly irritating and possibly corrosive to the upper respiratory tract. May cause coughing, sneezing, labored breathing, and possibly burns with perforation of the nasal septum. Ingestion of Calcium oxide May attack the esophagus. Abdominal pain, nausea, vomiting may result. May cause serious alkali burns in mouth and throat. If skin contacts Calcium oxide may cause severe corrosive damage. When Eye Contact it, the severe irritant, may damage eye tissues, causes redness, tearing, blurred vision, pain. 

Chronic inhalation of Calcium oxide may cause inflammation of the respiratory passages, ulcers of the mucous membranes, and possible perforation of nasal septum. Persons with pre-existing skin disorders or eye problems or impaired respiratory function may be more susceptible to the effects of the substance.

Now we will tall about the measures:

First Aid Measures

Inhalation: Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Call a physician.

Ingestion: DO NOT INDUCE VOMITING! Give large quantities of water or milk if available. Never give anything by mouth to an unconscious person. Get medical attention immediately.

Skin Contact: Immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Call a physician, immediately. Wash clothing before reuse.

Eye Contact: Wash thoroughly with running water. Get medical advice if irritation develops.

Fire: Not considered to be a fire hazard. Lime and water can react exothermically with sufficient heat to ignite combustible materials in certain instances.

Explosion: Not considered to be an explosion hazard. The combination of lime and water at high temperatures may be explosive. 

Fire Extinguishing Media: Use any means suitable for extinguishing surrounding fire. 

Special Information: In the event of a fire, wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode.

Accidental Release Measures

Ventilate area of leak or spill. Keep unnecessary and unprotected people away from area of spill. Wear appropriate personal protective equipment as specified in Section 8. Spills: Pick up and place in a suitable container for reclamation or disposal, using a method that does not generate Calcium oxide.

At last we can learn some knowledge about the Handling and Storage of Calcium oxide.

Keep in a tightly closed container. Protect from physical damage. Store in a cool, dry, ventilated area away from sources of heat, moisture and incompatibilities. This strongly alkaline material will swell and generate heat when moistened and could burst container. Containers of this material may be hazardous when empty since they retain product residues (Calcium oxide, solids); observe all warnings and precautions listed for the product.

Frankie is the freelance writer for e-commerce website in the chemistry. Guidechem.com is just a place for you to look for some chemicals. Our guidechem provide the most convenient conditions for the international buyers and let these leads benefit all the business people. Guidechem chemical B2B network provides information on china and global chemical market quotation and relative chemical Information. Guidechem Chemical Network providing the most complete information of the chemical inCalcium oxidery.

Something you may unknown about Calcium oxide

Calcium oxide is a kind of chemical compounds with the Chemical formula CaO. It is a colorless, cubic crystalline or white amorphous substance. Calcium oxide has many aliases, we often call it lime, quicklime, or caustic lime, its CAS No is 1305-78-8. In this article , we will tall about the basic feature and an unusual usage of Calcium oxide.

Now , let me show you the feature of Calcium oxide.

Calcium oxide is a strong emotional oxide, white or gray lumps or granules. It is sensitive to the wetlands and easy to absorb carbon dioxide from the air and water. Calcium oxide absorb the water, and make reaction with water, product calcium hydroxide, then calcium hydroxide can react with carbon dioxide in the air, at last Calcium oxide will become calcium carbonate, So Calcium oxide can not be stored in damp place for long time.

In above paragraph, we have known that calcium oxide can soluble in aqueous calcium hydroxid, in this process it also generates a lot of heat. Not only, Calcium oxide can soluble in water, but also in acids, glycerol .But practically insoluble in ethanol and sucrose solution. The relative density of 3.32 to 3.35. Melting point 2572 ℃. Boiling point 2850 ℃. Refractive index 1.838. Corrosive

You must know Calcium oxide can produce heat, be used as raw material and desiccant, but you may never heard that Calcium oxide can be used as a weapon.Now, let me tell you an interesting story about Calcium oxide.

Historian and philosopher David Hume, in his History of England, recounts that early in the reign of Henry III, the English Navy destroyed an invading French fleet by blinding the enemy fleet with Calcium oxide: D’Albiney employed a stratagem against them, which is said to have contributed to the victory: Having gained the wind of the French, he came down upon them with violence; and throwing in their faces a great quantity of Calcium oxide, which he purposely carried on board, he so blinded them, that they were disabled from defending themselves. Calcium oxide is also thought to have been a component of Greek fire. Upon contact with water, Calcium oxide would increase its temperature above 150 ℃ and ignite the fuel.

After reading this passage, have you made a deeper understanding of Calcium oxide?

Frankie is the freelance writer for e-commerce website in the chemistry. Guidechem.com is just a place for you to look for some chemicals. Our guidechem provide the most convenient conditions for the international buyers and let these leads benefit all the business people. Guidechem chemical B2B network provides information on china and global chemical market quotation and relative chemical Information. Guidechem Chemical Network providing the most complete information of the chemical industry.