(2) Sally starts eluting her column with petroleum ether in hopes of separating her 50:50 ferrocene: fluorenone mixture. She notices her mobile phase getting low when there is limited separation between her two components. She eagerly adds more solvent to avoid her column from drying out. Sally then realizes she poured from her 1:1 petroleum ether: diethyl ether beaker rather than her petroleum ether beaker. (a) Using the molecular view below, explain how this would impact her product elution from the column. top of column -- buret wall Al UU Al O: 0: AI :0: H H buret wall bottom of column (b) How does this error impact her experimental results? (c) Using pictures and words, how could Sally analyze the purity of her product?

(2) Sally starts eluting her column with petroleum ether in hopes of separating her 50:50 ferrocene: fluorenone mixture. She notices her mobile phase getting low when there is limited separation between her two components. She eagerly adds more solvent to avoid her column from drying out. Sally then realizes she poured from her 1:1 petroleum ether: diethyl ether beaker rather than her petroleum ether beaker. (a) Using the molecular view below, explain how this would impact her product elution from the column. top of column -- buret wall Al UU Al O: 0: AI :0: H H buret wall bottom of column (b) How does this error impact her experimental results? (c) Using pictures and words, how could Sally analyze the purity of her product?

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...

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(4) Below are depictions of a student's TLC plates in which fractions 1 - 10 from their column are spotted. Lane 1 2 3 4 5 67 8 9 10 (a) Which fractions contain pure fluorenone? Which contain pure ferrocene? (b) Which lanes, if any, represent mixed fractions? (c) Would the student incorporate lanes 6 and 7 into an Erlenmeyer flask of a combined fraction? Explain with 10 words or less.
(Concentration) You are tasked to prepare 300.000 ppb of a sodium carbonate standard for a titrimetric analysis. If you need to prepare 1000.00 (±0.06) mL of this solution, how much (in grams) solid, pure Na2CO3 are you supposed to dissolve? What absolute uncertainty is associated with your mass measurement if the prepared solution has a 0.1% percent relative uncertainty? Write your answer using the appropriate number of digits. Note that the formula mass of Na2CO3 is 105.9888 g/mol with negligible error. Assume that instrument precision is not a limitation in your lab. g (absolute error) How many significant figures does your reported mass have? (number of sig. figs.)
PS. Further values required for the solvings are give in the various situations below. (ANSWER) Situation: A community in a mountainous area of Bohol uses water collected from a nearby natural spring. A sample was submitted to a laboratory for the analysis of its total hardness. Required: SHOW YOUR COMPLETE CALCULATIONS. BASED ON THE IMAGE PROVIDED BELOW FOR THIS QUESTION: Calculate the amount of titrant used in each trial to reach endpoint. Report total hardness of the sample as mean ±sd. a. 250.0 mL of 500.0 ppm of CaCO3 solution from a primary standard (assume solvent is distilled water only). Answer : Mass of CaCO3 = 0.125 g b, The EDTA solution was standardized by titrating it with a 25.0 mL aliquot of the CaCO3 solution. How much of the titrant was consumed. Answer: Volume of EDTA consumed = 12.405 g c. Calculate the average titer (mg CaCO3/mL EDTA). Mass of CaCO3 in 25 mL CaCO3 solution: 0.0125 g Answer: 1.008 mg CaCO3/ mL EDTA
a) What would you see if you ran a Thin Layer Chromatography (TLC) on a mixture of the three solids shown below using silica gel as the stationary phase and ethyl acetate/hexanes as the mobile phase? Whichsolid would have the highest Rf and which would have the lowest Rf? Explain b) Would changing the mobile phase (from part a) and increasing thepolarity by introducing small amount of methanol to the mobile phase change the order ofRf of the above 3 compounds? Explain c) Another type of chromatography is Reverse Phase Chromatography. In this type ofchromatography, the stationary phase is non-polar and the mobile phase is polar. If astudent performed Reverse Phase TLC on the mixture of 3 solids (from part a),what would be the order of Rf’s of the compounds? Which would have the lowest Rf andwhich would have the highest Rf?
PAPER CHROMATOGRAPHY Additional details: 20mL distilled water + 20mL 95% ethyl alcohol solution was used Main Question: Give the inferences (by color) of the following spots in the picture below
4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.
[1] In paper chromatography, why do some ions move only a short distance from the point of application while others move much more?
why would you add 10 mL of concentrate to 490 mL of water if you were instructed to dilute the concentrate 1:50 with water and you were was using a bottle with a 500 mL capacity
Louie performed paper chromatography to identify which among the four available reference mixtures WAR, OFF, YIN, MEW – have the same components as his unknown sample, GUN. He spotted the standards and the sample in a Whatman No. 1 filter paper, which he placed in a developing chamber containing 3% KCl. After 20 minutes, Louie obtained the chromatogram below, immediately noting that the distance travelled by the solvent from the origin is 79.0 mm. On the other hand, the distances (in cm) traveled by the developed spots were tabulated as follows. solvent front- H I A C origin WAR OFF ΥIN MEW GUN DISTANCE DISTANCE TRAVELLED FROM SPOTS TRAVELLED FROM SPOTS THE ORIGIN, cm THE ORIGIN, cm A 2.70 F 5.40 4.75 G 2.90 2.25 H 4.10 2.85 3.50 I 3.25 4.95 1. Is the type of paper chromatography performed normal or reversed? Why?
25 ml of pickled brine was taken from an apple pickled with vinegar and diluted to 500 ml, 25 ml of this was taken and acidity was determined with 0.2 N (Factor: 1.05) NaOH. In the main trials, 6.3 ml - 6.5 ml - 6.9 ml, respectively, 0.1 ml base was used in the analysis without using the sample.For example, how many ppm is its acidity?
A three-component mixture containing compounds A, B, and C is separated by simple distillation. A fraction from that distillation is collected and analyzed by gas chromatography. The resulting chromatogram is overlaid on a ruler in the figure shown below. Using this figure and the data contained therein, determine the percentage composition of each component in this fraction by the triangulation method (i.e. determine the percentages of A, B, and C in this fraction). Be sure to show the setup for your calculations. 15 10 AAA 5. B 10 15 20 25 30 35 (both axes are in mm)
A student developed a new dye called Dye C. It was analyzed against other dyes using paper chromatography. A solution of 1:1 ethyl acetate:hexane was used as the eluent. The resulting chromatogram is shown below. What other dye/s are present in dye C? Which dye contains the least number of pigments?