DETERMINING THE PRESENCE OF CARBON AND HYDROGEN IN CARBON COMPOUNDS

Group Member:Priscilla Viera x3-28Shierly Irawan Halim x3-29Debby Alimhamzah x3-11Annabella Sulianto x3-06

Result

Organic Compounds :1. Sucrose2. Glucose3. Starch4. Citric acid

The organic compounds produced bubble for chalk water, but not only that, the cobalt chloride paper turned into pink when being put on the organic compounds. Beside that, that chalk water, which connected to these organic compounds, became murk as long as the reaction. There also was caramelization during the reaction.

Inorganic Compounds :1. NaBr2. KBr3. KI4. NaCl

These inorganic compounds only produce less bubble for chalk water, but the cobalt chloride paper did not turn into pink, and there was no changing at all with the chalk water which connected to the inorganic compounds. There was no caramelization at all during the reaction.

Reactions

CO2 + Ca(OH)2 CaCO3 + H2O

The chalk water produce CO2, and the CO2 will react with chalk water, and produce white precipitate and water. The products of precipitation will be caught by cobalt chloride paper (CoCl2) that makes the cobalt chloride paper change from blue color become pink color.

CoCl2 CoCl2. 6H2O

The reactions above are the reactions when the cobalt chloride papers from blue color changes become pink. When the color changed become pink color, the cobalt chloride paper contain 6 water compounds (6 H2O) and if the cobalt chloride paper don’t change the color (blue) there are no reactions and the formula only CoCl2.

Discussion

From the result above, we can see in which the cobalt chloridepaper turned pink. Cobalt chloride paper shows either there is hydrates in the compound or not, which when it turns to pink, it means that there is hydratesor water within the compound (H2O). Why would it happen only in organic compounds? This can be happen because organic compound always changes H into H2O, which is water. Eventually, H2O will be absorbed by hydrates. On the other hand, inorganic compound cannot change H into water or H2O during the reaction, and so there will be no water formed which cannot make the cobalt chloride paper turns into pink. In other words, there were carbon and hydrogen in the organic compounds during the reaction, while there was none of carbon and hydrogen in inorganic compounds during the reaction.

Beside that, organic compounds could be caramelized during the reaction, while inorganic compound could not. This is because there was combustion in the organic compounds, which eventually makes the chalk water becomes murk in color. As we have known, there is combustion within the organic compound that needs oxygen during the reaction. Combustion will produce CO2 and H2O at last, but somehow, if there are many carbons in the compounds, the amount of oxygen is not enough for the reaction and that makes the combustion incomplete and produce soot(unburnt carbon) and calcium carbonate (CaCO3). This soot may make the chalk water becomes murk by caramelization occurred. While the inorganic compounds do not experience that way and so it inorganic compounds do not make the chalk water become murk.

Conclusion

So, the conclusion is in the organic compound that contain carbon and hydrogen, complete combustion is happened and CO2 is produced by the compound become caramelized. Then, CO2 will react with the chalk water (Ca(OH)2) which producing white precipitate and water vapour (H2O). The water vapour (H2O) will be absorbed by cobalt chloride (CoCl2) paper and there are hydrates that makes the cobalt chloride paper from blue become pink. For the inorganic compound there are no changes occurs in the process and there are no hydrates in the inorganic compound. That’s make the cobalt chloride paper didn’t change become pink.