9) Put 4mL of stock solution and 1mL of water in a test tube to make the second solution.…
2. To determine the densities of water, an unknown liquid, a rubber stopper, and an unknown rectangular solid.…
In this Laboratory experiment, my lab partner Alexander and I were able to understand thoroughly the physical and chemical properties of salt (NaCl) and sand (SiO2). Followed by the right procedure we were able to design and test out the components of both NaCl and SiO2 in order to separate the unknown mixture that we were able to find out about. We were also given the task to provide the percent composition of the mixtures. Therefore, the separation of components among this experiment allowed us to obtain the right numbers for our calculations.…
In this laboratory, triphenylmethanol was synthesised from reacting benzophenone and bromobenzene using Grignard reaction. As the reaction was to set up to produce a Grignard reagent and then recrystallize it to obtain pure sample. The percentage yield obtained was 55% and its melting point was 161 co which is within the literature value 160-163 co. In addition to that the IR spectroscopy confirmed the molecule structure to be triphenylmethanol.…
2. In chromatography, components of a mixture distribute themselves between the stationary phase and the mobile phase. Explain how the components can be separated with these two phases.…
Tryptophane is the largest amino acid. Also two larger amino acids are Alanine and Serine. The largest Rf is Tryptophane. The polarity is like the Serine but the Alanine is nonpolar.…
The objective of the deicer lab was to successfully conduct experiments to determine the usefulness of magnesium chloride as a deicer. To find how successful magnesium chloride is as a deicer, experiments were conducted to determine the freezing point depression, enthalpy of dissolution, the impact on the surrounding environment, and also the expenses of using magnesium chloride as a deicer. For magnesium chloride to be determined as a good deicer, the reaction with water needs to be exothermic so ice’s freezing point will be higher, and also have an environmentally and economically positive affect.…
Note: Please post this assignment to your dropbox. THE DROPBOX IS ANAGALOGOUS TO AN E-MAIL ACCOUNT. (To accomplish your assignment, you may cut&paste the observations section of the assignment into your text editor (such as Microsoft Word). Complete your answers - then send the answers as an attachment to the dropbox. Attachment examples include Word document, Excel graph, etc.) Your dropbox can be entered via the dropbox tab at the top of the screen. Make sure you title your assignments properly. You do not need to show your calculations. Edit the observations sheet to present the data in a clear fashion. USE CAPITAL LETTERS FOR THE TEXT/DATA YOU ENTER IN YOUR REPORT.…
This experiment was performed in collaboration with Paula Mendoza. Exceptions to the procedure are: no NMR or wet chemical test for both compounds. Since there was a lack of organic compound we were unable to proceed with any of the identifying tests.…
Grignard synthesis of triphenylmethanol was achieved by use of the Grignard reagent phenyl magesium brominde. The organometallic grignard reagent was synthesized by use of a reflux apparatus recrystallization techniques. Once synthesized it was used in a Grignard reaction that involved nucleophilic addition to a carbonyl in order to make triphenylmethanol. The final product was solidified and recrystallized and spectral data was obtained to confirm its presence.…
I’d first like to say that while errors did occur during your TLC you did a good job getting visible results on your TLC plate, as sometimes it can be hard to get a sample to show up clearly on the plate. But not knowing which compound is which is a huge problem that will lead to incomplete conclusions and the need to redo your TLC. However, due to the knowledge we have of the compound on the plate we can determine which compounds are which. The two compounds you used are very similar in structure with one very important difference of the hydroxyl group on 4-phenylphenol that isn’t present in biphenyl. This hydroxyl group makes 4-phenylphenol more polar because of the possibility of hydrogen bonds between the compound and the silica on the…
While Grignard reagent was successfully produced, the production of adequate amounts of triphenylmethanol was unsuccessful. Grignard reagent synthesis was successful as evidenced by the signs of a chemical reaction occurring in the second half of the experiment aligning with expectations, such as the pink color displayed in figure 4. However, not enough triphenylmethanol was produced to perform analysis such as NMR and IR, so a stock sample of it was used to perform analysis. This may have occurred due to a presence of water or excessive amounts of dehydrating agent being used, which would have caused triphenylmethanol to degrade. However, analysis of the stock sample was still performed, and showed that the stock sample was very…
Marker Color # of pigments observed after separation Each pigment color found after separation Most Soluble pigment in mixture Least soluble pigment in mixture…
4. If a molecule has high affinity for the mobile phase, how is the Rf value affected?…
Thin Layer Chromatography or TLC is a technique used as a separation and identification technique. There are many forms of chromatography, but one thing that remains constant throughout all of the types of chromatography is that there is a stationary phase and a mobile phase. In the case of TLC the stationary phase is the silica gel on the TLC tray.…