Carbon monoxide reducing copper oxide

Experimental Equipment

formwork units, lamp alcohol (alcohol may be a burner), tubes, catheters, double rubber stopper, the rubber stopper hole, the exhaust gas treatment apparatus (namely: alcohol lamp )

drugs are: copper oxide, to clarify the lime, carbon monoxide

chemical

reaction with the chemical equation CO CuO is:

CuO + CO == △ == Cu + CO2 monoxide reduced copper oxide may also generate an intermediate cuprous oxide Cu2O

NOTE: this reaction type is a redox reaction

CO2 and Ca (OH) 2 (lime clarification) chemical reaction equation:

Ca (OH) 2 + CO2 = CaCO3 ↓ + H2O

the reaction phenomenon

turns bright red black solid ① ② ③ conduit opening for bubbles to clarify the cloudy limewater

experimental procedure

1. Connecting means

2. Airtightness inspection apparatus.

3. Heated Exhaust Gas lamp ignition alcohol.

4. Into CO.'S, to exclude the air in a series arrangement to prevent explosions.

5. Heating CuO.

6. Stop heating CuO.

7. Into CO, drain any trapped air in the series arrangement.

8. Stop ignite the exhaust.

Note: ① CO into first moment, in order to drain the air in the glass tube, to prevent carbon monoxide and oxygen mixture heated explosion.

② CO was continuously fed until the glass tube was cooled down to prevent lime sucked into a glass tube (here are not oxidized because there is no glass in the presence of oxygen)

summary: "CO spare, alcohol lamp tardiness" ③ lamp is ignited exhaust gas treating alcohol: to prevent air pollution carbon monoxide poisoning people.

NOTE: The test should be performed in a hood: not prevent CO poisoning of people Ex.

CO reduction

The chemical properties of carbon monoxide and hydrogen are also similar, having a reducing property, but also toxic flammable, it is reduced to copper oxide copper, while generating carbon dioxide gas to clarify the lime became cloudy.

Since a reducing carbon monoxide, so it is used as a reducing agent in metallurgical, certain reduced metal from its metal oxide, such as iron when using carbon monoxide, iron from its oxide - iron oxide restore them.

3CO + Fe2O3 == temperature == 2Fe + 3CO2

can be seen from the above: the nature monoxide and carbon dioxide are different.

monoxide and carbon dioxide but can be transformed between each other: the carbon monoxide combustion generates carbon dioxide, which react with carbon, but also produce carbon monoxide.

combustion of carbon monoxide to form carbon dioxide: 2CO + O2 == ignition == 2CO2

is reacted with carbon dioxide to produce carbon monoxide: CO2 + C == temperature == 2CO

CO properties

physical properties < / h3>

under normal conditions, carbon monoxide is a colorless, odorless, tasteless, toxic gases, the melting point of -199 deg.] C, a boiling point of -191.5 ℃. The gas density under standard conditions 1.25g / L, and the air density (standard conditions 1.293g / L difference is small, which is one of the factors susceptible to gas poisoning. It is a neutral gas.

molecular structure: carbon monoxide molecules are polar molecules, molecular shape is rectilinear

chemical properties of

molecules of carbon monoxide to carbon valency is twelve, can be further oxidized to +4. price, thereby reducing carbon monoxide and flammable, or oxygen, carbon monoxide can be combusted in air to produce carbon dioxide: 2CO + O2 = lit = 2CO2 (CO2 conversion into CO.'s, the chemical equations: CO2 + C = temperature = 2CO) < / p>

bonding method of carbon monoxide: when the C and O compound, C p orbital two electrons and O p orbital unpaired two electrons forming two unshared electron pairs, and then, the p orbital of C there are on an empty p orbital track, and a pair of O lone pair of electrons, forming the third electron pair (this is a coordinate bond), forming a triple bond is a carbon-oxygen.

emits light blue flame combustion, emit a lot of heat. Thus the carbon monoxide may be used as the gaseous fuel.

carbon monoxide as a reducing agent, capable of many metal oxides are reduced to elemental metal at a high temperature, commonly used in the metal the smelting: the dark red copper oxide is reduced to metallic copper, the reduction of zinc oxide to zinc metal, iron oxide and tri-iron tetroxide reduced to metallic iron