Where it resulted to values of 3.990602 x 10-3 s-1, 4.653278 x 10-3 s-1, 5.944044 x 10-3 s-1, 7.499958 x 10-3 s-1, 7.499958 x 10-3 s-1, 9.84554 x 10-3 s-1, for flasks 4, 5, 6, 7, 8. Then the Ionic strength was calculated using the equation µ=½∑ ci zi2 . Which resulted in 4.5392142 x 10-2, 6.4999998 x 10-2, 1.23823528 x 10-1, 2.21862742 x 10-1, and 4.17941175 x 10-1. It
Experiment 2.1 Absorption Spectrum of a Conjugated Dye Table of contents * Page 1 Title sheet & Table of contents * Page 2 Introduction & Abstract * Page 3 Abstract continued, Method & Results * Page 4 Results * Page 5 Results * Page 6 Results * Page 7 Discussion * Page 8 Introduction: The purpose of this experiment was to determine a relationship between energy levels and wavelengths in a range of dyes in a manner that would satisfy the Schrodinger wave equation and Eigen functions. This would be achieved by finding the maximum absorption for a particular dye and using that information, working out an alpha value to determine the wavelength of the molecule and from that, the discrete energy value. A successful experiment would involve the wavelength increasing as the number of conjugate electrons increases and also show a decrease in energy of the wavelength. Abstract: UV Vis spectroscopy is a method of analysis that measures transitions between a ground state and an excited state in a molecule. This method of analysis was used to determine the maximum absorption for the four dyes used in the experiment.
One vaporization and condensation cycle is called a theoretical plate. The greater the amount of theoretical plates, the better the separation will be. In this experiment, there are two theoretical plates. The first plate is the initial distillation where three different fractions are collected over different temperature ranges. The first fraction is collected at 60-75℃, the second fraction is collected at 75-85℃ and the final fraction is collected at 85-105℃.
(3 marks) (ii) What is the chromatographic mechanism involved? Describe how the mechanism effects separation to the three compounds. (8 marks) (iii) With explanation, describe what would happen to the peaks in the chromatogram when the packing silica with a larger pore size and smaller surface area is used in the above separation. (6 marks) 2. A mixture of Br-, Cl- and PO43- ions was subjected to an anionic column packed with polym-N(CH3)3+OH-, eluted with 9mM sodium carbonate.
What pieces of laboratory equipment would you use to measure the properties needed to determine the density of a substance? The piece of laboratory equipment needed to find mass is a balance and for volume a graduated cylinder. 3. Using the properties stated in question 1, write the formula for density. D=m/v 4.
0.36 B. 2.3 C. 9.0 D. 11 (1) 3. What is ∆H for the reaction below in kJ? CS2(g) + 3O2(g) ® CO2(g) + 2SO2(g) [∆Hf / kJ mol–1: CS2(g) 110, CO2(g) – 390, SO2(g) – 290] A. −570 B.
Adjust the percent transmittance to 100% 4)our out the water in the cuvet, and fill with 2/3 of the reference solution. Read and record absorbance data. Read from lower concentration to higher concentration. 5)Continue to collect absorbance data for al reference and test solutions 6)Dispose of the contents of the cuvets. Data Tables #1 Reference Solutions for the Calibration Curve Sample [FeSCN2+] Absorbance Reference Solution #1 4x10-5 .2034 Reference Solution #2 6x10-5 .3028 Reference Solution #3 8x10-5 .3915 Reference Solution #4 1.0x10-4 .4908 Reference Solution #5 1.2x10-4 .5768 #2 Test Solutions Temperature - 21.9°C Sample [Fe3+] [SCN-] Absorbance Test Solution #6 1.0x10-3 2.0x10-4 .1002 Test
Then by writing a balanced chemical equation and using the titration formula, Nb+Ma+Va=Na+MbVb , the molarity is able to be determined. Procedure: 1) Using the graduated cylinder add 10.0 mL of water into the Erlenmeyer flask. 2) Add 5.0 mL of HCl into the flask using another graduated cylinder because acid goes into water when mixing them. 3) Add three drops of phenolphthalein indicator into the flask. 4) Swirl the flask in circular movements to mix the substances.
Practical 5 – Heavy Metals by Absorption Spectrometry Contents Aim - 1 Introduction 1 Procedure 2 Pre-laboratory exercises 2 Results and discussion 3 Conclusion 3 References 3 Aim – The aim of this practical is to determine the concentrations of each of Cu, Pb and Cd in an unknown solution with the use of Atomic Absorption Spectrometry. Introduction Atomic Absorption Spectrometry or ‘AAS’ is a spectrophotometric analysis technique that allows for both quantitative and qualitative determination of most elements. Each elemental metal absorbs ultraviolet light at a specific wavelength when excited by heat; this is the basis of atomic absorption spectrometry The procedure involves passing known concentrations of the element in solution through a nebulizer forming a mist. This mist is then aspirated into a flame forming gaseous atoms, elementary ions and molecular species. A focused beam of ultraviolet light at a specific wavelength is directed at the sample, reduction in the intensity of the light is then measured and converted to absorbance.
http://www.chatham-kent.ca/WaterandWastewaterServices/Water/Pages/DrinkingWaterConsumerReports.aspx a) What chemicals are used in our water treatment plant? Briefly describe the purpose of each. [8] b) Is fluoride added to our water? [1] c) What is the range of hardness of our water? [1] d) Using the following link, describe the hardness of our tap water.