4. Let's suppose that during the freezing point depression experiment, you weigh out about 2.50 grams of solid unknown. Then you attempt to pour this unknown into the p-xylene solution, but you inadvertently spill some of your unknown onto the floor. Since you're in a hurry to get outside and enjoy the sunshine, you pretend nothing happened and run the experiment with whatever unknown actually made it into the p-xylene. How would this specifically affect the calculated molecular weight of your unknown? Explain

4. Let's suppose that during the freezing point depression experiment, you weigh out about 2.50 grams of solid unknown. Then you attempt to pour this unknown into the p-xylene solution, but you inadvertently spill some of your unknown onto the floor. Since you're in a hurry to get outside and enjoy the sunshine, you pretend nothing happened and run the experiment with whatever unknown actually made it into the p-xylene. How would this specifically affect the calculated molecular weight of your unknown? Explain

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

In glucose estimation using Benedict's Reagent, justify the necessity of continuously heating the solution while it is titrated with Benedict's reagent.
In this lab, you used rotary evaporation to remove the neutral organic solvent. Rotary evaporation is an example of a distillation except under conditions of a reduced pressure atmosphere. What effect does a reduction in atmospheric pressure have on the observed boiling point? Explain your answer.
1a. Use the given table to construct a temperature-composition diagram for cyclohexane Toluene mixture. Based on the plot, what is the composition of the distillate obtained by Simple distillation 20 mole percent cyclohexene and 80 mole percent toluene? Show your Work on the plot. 1b. Estimate the composition of the distillate of 20 mole percent of cyclohexane if the Distillation column had three theoretical plates.
Q2
"Consider a crystallization of sulfanilamide in which 10 mL of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanilamide. After the solid has dissolved, the solu-tion is cooled to room temperature and then placed in an ice-water bath. No crys-tals form, even after scratching with a glass rod. Explain why this crystallization failed. What would you have to do at this point to make the crystallization work? You should assume that starting over again with a new sample is not an option. (You may need to refer to Technique 11, Figure 11.2.)2.Benzyl alcohol (bp 205°C) was selected by a stu"
Which bond is most polar? C-F C-O C-I C-Cl C-Br
Show your calculation for the preparation of 100 mL of a solution of approximately 4 mM (that is 4 x 10-3 M) o-nitrophenol (M.W. 139.11 g mol-1) using 0.40 M Na2CO3 as the solvent.
A student forgot to add the mass of the unknown solute in trial 1 to the mass of the solute that was weighed for trial 2 and then added to the cyclohexane-solute solution used in trial 1. How would this omission affect the calculated molecular weight of the solute?
If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase? 1 extraction 2 extractions 3 extractions 4 extractions
Based on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?
Can someone help me out here? There first time I calculated the theoretical yield for this experiment I got 0.540g with the given values but I actually used the wrong values. I added the new values above and the units used are mols. I can't seem to figure out or remember how I calculated 0.540g with the (3.00x10^-3 mols)(0.0098 mols). Can someone please help me by telling me how to get grams by using the equation (0.002995 mols)(0.0105mols)? I know the value should be relatively close to 0.540g but every time I try to calculate it, my answer is no where near 0.540g. Please answer clearly and concisely. Also please make sure to read the question carefully, thank you!
7- Place the stopper on the volumetric flask and mix the solution thoroughly by inverting and shaking the flask. Don't add water to a level above the line on the neck of the flask. beaker balance $4.68 stirrer bar 6 volumetric flask C D Conclusion: state the concentration of your solution. E E Analysis: a. Calculate the concentration of your solution. b. Why was it necessary to invert the volumetric flask? c. Why should the final solution be left stopper? d. If we filled the flask to above the line how would this have changed the concentration of the solution?