AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
The mass of oxygen in the sample will almost always be determined by subtraction.ĥ) Often the N is determined via a second experiment and this introduces a bit of complexity to the problem. Other elements can be involved, but problems with C and H tend to predominate followed by C, H and O and then by C, H, O and N.Ģ) We must know the mass of the unknown substance before burning it.ģ) All the carbon in the sample winds up as CO 2 and all the hydrogen in the sample winds up as H 2O.Ĥ) If oxygen is part of the unknown compound, then its oxygen winds up incorporated into the oxides. Oxygen is often involved and nitrogen is involved sometimes. Some points to make about combustion analysis:ġ) The elements making up the unknown substance almost always include carbon and hydrogen. This technique is also called "elemental analysis" This technique has been most often applied to organic compounds.Ī brief discussion (yet quite informative) of the history of this technique can be found here. From this, you will be able to calculate the empirical formula of the substance. The combustion products will be trapped separately from each other and the weight of each combustion product will be determined. This technique requires that you burn a sample of the unknown substance in a large excess of oxygen gas. Go to a discussion of empirical and molecular formulas. ChemTeam: Combustion Analysis Combustion Analysis
0 Comments
Read More
Leave a Reply. |