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Estimate the detection limits for the analysis of ethanol bydirect injection and head-space analysis. Discuss ways in which thedetection limits could be decreased. ...

Question

Estimate the detection limits for the analysis of ethanol bydirect injection and head-space analysis. Discuss ways in which thedetection limits could be decreased. This is for the GasChromatograph- Beer lab

estimate the detection limits for the analysis of ethanol by direct injection and head-space analysis. Discuss ways in which the detection limits could be decreased. This is for the Gas Chromatograph- Beer lab



Answers

In one type of Breathalyzer (alcohol meter), the quantity of ethanol in a sample is related to the amount of electric current produced by an ethanol-oxygen fuel cell. Use data from Table 19.1 and Appendix $D$ to determine (a) $E_{\text {cell }}^{\circ}$ and $(\mathbf{b}) E^{\circ}$ for the reduction of $\mathrm{CO}_{2}(\mathrm{g})$ to $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(\mathrm{g}).$

Mhm. Because Benzene absorbs in the ultraviolet spectrum, but ethanol does not. We could use you vivas spectra for tom a tree to determine the concentration of benzene in denatured ethanol in the process. For doing so would take advantage of Beer's law, uh or the beer Lambert law, which say states that absorbency is equal to the Mueller absorptive Itty epsilon times the path length. L. Times concentration. The Mueller absorptive itty for Benzene is going to be a constant and the path length will be the same. So if we make four or five solutions with a known concentration of benzene dissolved in ethanol, we can measure the absorbency for each solution and then generate a graph of absorbent on the Y. Axis versus concentration of benzene on the X axis. So we'll have our data points plus whatever the absorbent is when the concentration is zero and there's a range in which that's a linear relationship or a linear proportionality. So we can fit a straight line to the data, which then becomes a calibration curve. So once we have the calibration curve, we obtain the even the spectrum of the denatured ethanol that we're investigating. We identify the absorbency value and it should be um somewhere between the minimum and maximum absorb ince's on our calibration curve, and then we just follow along over to the corresponding point on line and then drop down to determine the concentration. Or we can use the linear equation Y equals Mx plus B. Where why is the absorbency value X. Is the concentration? And we'll know the slope M. And the Y intercept B from the calibration curve. So then we just mathematically solve for X.

So we're looking out the beer Lambert lower again. So we know that our bier Lambert Law states that a equals C times at all times e by just a za ki hair to contextualized this equation a equals absorb INTs C equals concentration. L equals past like on e equals mal absorptive ity. So we have some values upon the screen that we will just plug into our equation. So is unknown. Here Al is one centimeter is 2 30 out to 69 m. So we need to do is just plug the numbers into our equations on rearranged. So we've rearranged for concentration equals over out times e So again we still don't know what that absorb Ince's So we have a of a one times 2 30 gives us our concentration

So we are told that we have to substances your area or your area, and that is a solid at room temperature. And then we also have ethanol, which is a liquid it room temperature, and were asked, How are we going to measure them? How would you measure the amounts of that you have? I mean, with a your air. The easiest thing to do would just used to use a balance and get the mass. Generally what we do for solids, you might be able to grind it up into a fine powder and get its volume. But that seems rather messy. So I would just use the balance and get mass. When you have liquid, you have more options. You could certainly use the balance and get this mess. Um, but it might be better to get volumes and the volume you could use to Penny how much you had. You could use a graduated cylinder of some kind. You could use, uh, different kinds of pipettes if they're marked off. Um, but anyway, I would suggest measuring the volume shows is easier to measure than, uh, mass for a liquid

Let's discuss the problem from organic chemistry. This problem is based on the fermentation of organic compounds here. First we have to write the question for the fermentation of glucose to form ethanol. Then we will answer that. Why it's in all solutions of greater than 13% concentration can be made directly by fermentation, and also we will discuss how ethanol content can be increased beyond this level in beverages. So, first we will write the equation for the fermentation of glucose. Do it in all here. Glucose molecule that is, C six actual or six undergoes fermentation in the presence of east introduces it in all with the information of carbon dioxide mhm the east necessary for the fermentation process. Our guilt f The concentration of ethanol is greater than 13% more concentrated it and all solutions are most commonly made by destination.


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