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- MTN-SA 36ll O *I § 100% 13:39 KAMVA KD 9. During an assay of paracetamol by UV an analyst prepares a series of calibration solutions containing approximately 3-15 mcg/mL paracetamol as follows: • 141.7 mg of pure paracetamol was added to a 200 mL volumetric flask. • 0.1 M NaOH (50 mL) was added, the mixture well shaken and made up to volume with deionized water • 10 mL of the above solution was diluted to 100 mL a) What is the concentration of the final diluted solution in mcg/mL? Answer = mcg/mL (1 decimal) b) What volume of the diluted solution is required to prepare 100 mL of a 11 mcg/mL standard ution? Answer = mL (1 decimal) 33LTE lI. 9:.0 A docs.google.com Llä 4 A strong absorption band at 3400 cm-1 in an IR spectrum indicates the presence of a/an Ether Alkyne Carbonyl group Alcohol Llä 4 The vibrational frequency for molecule calculate by using v/2Mc = (µ/F)½ v=1/2nC (F /)½ v=1/2nC (µ/F)½ v/2n= C (F/µ)½ blö 4 The IRepoctrumof methyl salicylateexplain the differences between NH4-N and TKN methods.
- Avobenzone is used in sunscreens. A UV spectrum of a 3.0 mL sample of avobenzone (310.4 g/mol) in a 1.0 cm cell was obtained. The molar extinction coefficient for avobenzone is 9120 M¹¹cm ¹. The UV spectrum revealed a λ(max) of 300 nm with an absorbance of 0.80. Calculate the mass of avobenzone in the solution. ODuring a spectroscopic evaluation of the several solutions of C6H5CH=CHCCl₂ in ethanol using a 1.0 cm spectrophotometric cell, different values of absorbance (A) were obtained, which are given in the following table: 105 x conc. mol dm-3 A time min A 0.446 0.080 0 0.560 C When the reaction of C6H5CH=CHCCl₂ with C₂H5O in an ethanolic medium is followed spectroscopically at a convenient wavelength (2), the following results are found: 0.812 0.145 40 0.283 1.335 1.711 0.240 0.305 80 0.217 120 2.105 0.378 0.168 140 0.149 The values of ε at λ and the rate constant for that reaction are: a. ε = 1.79x10-6 dm³ mol-¹ cm-¹ and k = 0.034 dm³ mol-¹ min-¹ b. ε = 1.79×104 dm³ mol-¹ cm-¹ and k = 0.034 dm³ mol-¹ min-¹ c. ε = 1.79x10-6 dm³ mol-¹ cm-1 and k = 8.9x10-³ dm³ mol-¹ min-¹ d. ε = 1.79×104 dm³ mol-¹ cm-¹ and k = 8.9x10-³ dm³ mol-¹ min¯¹17:YV I YV 91U, 30l zain IQ [Template] Photoche... -> Homework (1): When a sample of 4-heptanone was irradiated for 150 s with 315nm radiation with a power output of 60 W under conditions of total absorption, it was found that 3.8 mmol C;H4 was formed. What is the quantum yield for the formation of ethene?
- Exp 6. IR Spectroscopy OH NaOCI ACOH, 45-50 °C CS Scanned with CamScannerThe DPD colorimetric method is used to determine the amount of residual chlorine in the sample. In this method, the free chlorine in the sample oxidizes the colorless amine N,N-diethyl-p-phenylenediamine to a colored compound that absorbs strongly at 520 nm. The analysis of a set of calibration standards gave the following results:ppm Cl2 Absorbance0.00 0.00310.50 0.12321.00 0.32411.50 0.54382.00 0.76422.50 0.95513.00 1.1565A 10.00 mL water sample from a public water supply was diluted to 250 mL and analyzed for free chlorine residual, giving an absorbance of 0.3210.A. Find the equation of the line.B. What is the molar absorptivity of Cl2 (FW = 70.9) at 250 nm?C. Calculate the free chlorine residual of the sample as ppm Cl2.D. Calculate ppm BaCl2 (FW = 208.2)?Chemistry Estimation of Rhodamine B in Wastewater-UV-VIS Spectrophotometry
- I. Look at the MS/MS for paracetamol (a drug), explain the peaks seen at 134 and 110, and draw the structure for the 110 peak. Paracetamòl N-(4-hydroxyphenyliacetamide ESI+, MS/MSs Kky pan_03_c80720211368 1-38 RT: 0.00024 AV 35 N: 107ES T TMSES F ms 12.00g24 00 0 00-10.0g 100g 110.0 CH но 70 (M.H]* 162.0 16 1340 130 100OCHEM 2 You have to obtain the UV-Vis spectrum of biphenyl which has an absorbance maximum at 245 nm. Which of the following solvents (toluene, methanol, hexane) would you use for the task? Explain.The biuret reaction is a general method for the determination of proteins or peptides. This method is based on the reaction of the Cu2+ with four NH groups of the peptide bonds, forming a violet complex with an absorption maximum at 540 nm. The intensity of the color is proportional to the number of peptide bonds present, and therefore to the amount of protein. This reaction is specific, the dipeptides and amino acids give a negative reaction, and few substances interfere. A quantity of 19.89 g of fish meat is extracted with 100 mL of glacial acetic acid. Subsequently, 3 mL of the previous solution with 3 mL of the biuret reagent to generate the reaction, after 30 minutes. To reduce errors due to other interfering substances and residual turbidity, the corrected absorbance method Ac is applied to 500 nm and 570 nm. In a study, a standard sample analyzed by the Kjeldahl method (total Nitrogen analysis) is obtained, resulting in 0.43% N (w / v), (Protein content [%] =% N x 6.38). 3 mL of…