Lab 06 -Kinetics of Crystal Violet Lab Report Worksheet 2022-1 copy

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3. Using the data at right: a. Calculate the absorbance of each sample. You will need to express the %T values as decimals before calculating the logarithms. (e.g., for T = 25%, A = -log 0.25 = 0.602) b. Use the graph paper on the back of this page (or a spreadsheet) to plot absorbance vs. concentration. Make a proper graph, with labeled axes, uniform scales, etc. Use a ruler to draw the best-fit line.. C. Use the graph to find the concentration of the un- known sample. (Draw dotted lines on the graph showing how you found your answer.) CONCENTRATION PERCENT (ppm) TRANSMISSION 0 100.0 100 74.1 200 54.9 300 40.7 400 30.1 500 22.3 unknown 31.6 ABSORBANCE

In 1-pentanol mass spectroscopy, there would be a prominent M - 18 peak in the mass spectrum Draw the structure (radical) that would give the M-18 peak. Instructions: 1) Draw the positively charged radical (Lewis structure or line structure) - not just the formula. 2) You can upload your drawing (image) here or in a file containing all your drawings (to questions that ask for drawings) in the last question. 12pt v Paragraph BI U A ✓

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Please answer all and post below the answer the source from where you got the answer thank you!

Show a sample calculation of how you converted your initial (t = 0) absorbance reading into a concentration. Copy and paste your three graphs below. Sample graph titles: “Determination of whether n = [insert order]”. Red    Time (min)  A  0  0.617  10  0.536  20  0.456  30  0.375  40  0.294  50  0.214  60  0.133      εb (L/mol)  79.1  Write what is the differential rate law. Predict how fast the reaction would go if the original concentration were tripled. Explain your logic. Use the integrated rate law to predict the concentration at 75 min. Show your calculation here. Calculate the half-life of the reactant at 75 min. Show your work here.

Determine the standard concentration of A through E and then the absorbance. I just need clarification on if I add together the two ml values given.

Project 2: Food Dye Spectroscopy   Which scale is most useful for reporting data from the spectrometer? Why?

Drag the appropriate labels to their respective targets. • View Available Hint(s) MgCl MgCl2 CaCl CaCl2 3 G1 CaCo, + G1 HCI H,O + G1 CO. → G1 G2 + G1 G1 Mg(OH), + G1 HCI G1 H,O G1 G2 + 2.

In a Stern-Volmer plot, what is the source of the largest fluorescence signal? 1.6 Ky=(1.35 ± 0.05)10°M" 1.4- 1.2 - 1.0 0.5 1.0 1.5 2.0 2.5 3.0 Concentration [µM] A. The solution at 0.5 micoMolar B. The solution at 3.0 microMolar C. The Blank FO/F

Why is it important for solutions to be diluted before they are run through spectroscopy?

4 B please

This question uses the same data as the previous question. The calibration curve is a graph of absorbance versus concentration. Absorbance is a dimensionless quantity. The slope of the calibration curve is m = 2.24 x 10^4 M^-1. Find the concentration detection limit.

4 A please

A sample solution containing quinine was analysed by fluorescence spectroscopy. 5 mL of the sample solution was diluted with 0.1 M HCl to a final volume of 100 mL. The fluorescence of the solution was measured and gave a value of 54. A reference solution containing 0.086 mg/mL of quinine gave a fluorescence reading of 38. A blank solution gave a fluorescence reading of 21. Calculate the quinine content of the sample solution in mg/mL.

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Explain the role of timescale of the experiment and the type of information you get from NMR.

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Consider the reaction : A+B 2 AB. A calibration plot was constructed using x as the concentration for AB in M and y as the absorbance value of AB, it provided the linear equation : y=25x+0.0008. Determine the concentration of AB in M if the absorbance value is 1.22. Round and report your value to the THIRD decimal place. Numeric value only, no unit. No new data to sa IMG 0915.jpeg e to search PrtScn Home

Standard addition. A blood serum sample containing Na gave an emission signal of 4.27 mV. A small volume of concentrated standard Na was then added to increase the Na concentration by 0.104 M, without significantly  diluting the sample. This “spiked” serum sample gave a signal of 7.98 mV in atomic emission. Find the original concentration of Na in the serum.

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5. Answer the following post-lab questions for each reaction: a) What type of reaction is occurring? b) Based on the spectral data, how can one tell if the reactant is converting to product (i.e. what peak transitions are observed)? How can one tell when the reaction is complete? c) Focusing on the reactants only, which signal (report the chemical shift) is the furthest downfield and provide explanation why. d) Focusing on the reactants only, how many 13CNMR signals would your reactants have?

Hello please help with number 4.