Analysis of The Dehydration of Cyclohexanol (Lab Report Sample)
In a sentence or two, state the purpose of the experiment. If the experiment is a preparative experiment, the introduction also includes the balanced equation for the reaction.
In organic chem, there are different types of experiments: technique and preparative. A technique experiment is one in which you are performing a technique for the first time and studying its details, for example, distillation and extraction. A preparative experiment is one in which a compound is synthesized from other reagents.
Physical Data Table
List the molecular weight, melting point, boiling point, density, solubility, and hazards of all pertinent chemicals used in the experiment. You can find this information in the CRC Handbook of Chemistry and Physics. (We have this book at school, and a CD-ROM version as well.) Or, you can find the information on the Internet (see: Hazard and Physical Data for Compounds page). Chemfinder.com is an excellent site to find this data. The physical data are most conveniently presented in tabular form, although in a preparative experiment you may put the amounts of reactants and products under the balanced equations for the reaction.
Calculate the amounts of reactants (or compounds to be purified) in moles and grams or mL (as applicable). In a preparative experiment, calculate the limiting reagent and the theoretical yield of the product. Be sure to include your calculations for these values.
Briefly summarize the procedure to be followed, preferably either as an outline or as a flow chart. You do not need to write out the procedure in complete sentences and do not copy directly from the Lab Manual. All you need is a brief but complete listing of what you plan to do in the lab. The first time you do a technique, such as distillation, include in the procedure section a description of how to assemble the apparatus and how to conduct the distillation. In later experiments, it will be sufficient to state only that the liquid was distilled.
Data Table and Observations
Your observations of the experiment as it progresses is important, new information. Write these observations (color changes, appearance of crystals, formation of an emulsion, boiling temperatures, test results, etc.) in your notebook as you do the experiment. Also record the weights of reagents and products and tare weights in this section.
In general, you do not need to re-write the Procedure section in these observations, instead, you may state that “the procedure was carried out as planned” or “the procedure was carried out as planned except . . . .” At times, however, you may have to write the procedure out partially. For instance, if you state “the solution turned green,” you will have to write out enough of the procedure so that your instructor will know at what step in the reaction the solution turned green. As a guideline, consider that from the procedure and data and observations sections, any chemist should be able to duplicate your experiment. With this in mind, be thorough but include only pertinent information.
ConclusionThis is the section in which you interpret the data obtained in the previous section. For instance, indicate the amount of purified compound that you obtained and how the purity and identity of the compound was assessed. In a preparative experiment, state the percent yield. Include and discuss instrument printouts, such as GC traces and IR spectra (if you have them). In this section, you can state whether or not the procedure was a good method for making the desired compound; if not, try to make suggestions to improve the method for future experimenters. Be sure to include a discussion of possible sources of error, and how that error would affect the overall yield.
Dehydration of Cyclohexanol
Course Number and Name
Dehydration of Cyclohexanol, Preparation of Cyclohexene
In this experiment, we are going to dehydrate Cyclohexanol using Phosphoric acid as a catalyst to produce Cyclohexene as a product. The process of dehydration involves the elimination of water (H2O) elements from a compound (Bockisch, et al. 2018). In this experiment, the water element will be separated from Cyclohexanol, and the end product will be Cyclohexene. To ascertain that the experiment's product contains alkenes compounds, a bromine chemical test will be performed.
Reagent Data Table
The main reagent in this experiment is Cyclohexanol (C6H11OH).
molecular weight (MW)
melting point (MP)
boiling point (BP)
This experiment requires 20.0g of cyclohexanol. Using the following variables; Weight of reagent used and Molecular weight of cyclohexanol and cyclohexene, we can calculate the number of moles of cyclohexene to be obtained at the end of the experiment given that;
Molecular weight of cyclohexanol=100g/mol
Molecular weight of cyclohexene=82g/mol
Find No. of moles of (C6H10) obtainable
=20.0g C6H11OH ×1mol C6H11OH100g C6H11OH×1mol C6H101mol C6H11OH
=0.20 mol C6H10
Now that it is known that 0.20 moles of C6H10 can be obtained, it’s all a matter of converting it to grams by multiplying the number of moles to the molecular weight of cyclohexene to obtain the theoretical yield:
=0.20 mol C6H10 × 82g C6H10 1mol C6H10
Basing on the data from the experiment, we had only obtained 8 grams of final product, and in comparison, with the theoretical yield, the percentage yield can be calculated as follows:
Percentage Yield=Actual yield(g)Theoretical yield(g)×100%
% yield=8 g C6H1016.4g C6H10x 100%
1 Set up the distillation apparatus as shown in the image below.
33051752350135Test tube00Test tube313682531496594882192967852-3844231281797Thermometer adapter00Thermometer adapter9131301301482Three-way adapter00Three-way adapter14144682381333Distillation condenser00Distillation condenser910210549910ThermometerThermometer6683552673488Claisen adapter0Claisen adapter
914400170180Water outWater inIce Water00Water outWater inIce Water590550276229050ml round bottom flask0050ml round bottom flask3308462294192025ml graduated cylinder0025ml graduated cylinder16871951941982795020126555564544222598727632014883154882191265555
2 Add into 50ml round bottom flask water and phosphoric acid 10ml each. Proceed to heating the solution until it starts boiling, continue heating until you collect cyclohexene product in the graduated cylinder when the temperature in our thermome
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