Experiment 4 And 5 For Chem 117 Chem 117 Lab Report

1726 words - 7 pages

The purpose of Experiment 4 was to determine the effects of concentration on the amount of light transmitted through aqueous solutions.
The general procedure used in this experiment was to first prepare an undiluted sample of copper sulfate by obtaining two clean cuvettes. One of the cuvettes was used as a blank sample filled with deionized water which served as a solvent, and on the other cuvette, it was rinsed out with 0.5 mL of the copper sulfate solution and filled up with about 80% of the same solution. The second cuvette served as our undiluted solution. Next, 3 diluted solutions of copper sulfate are prepared. The first diluted solution was equal to 50% of the stock copper sulfate solution, the second 25%, and the third 12.5% of concentration from the stock solution. For each of the diluted solutions, a cuvette with solution is rinsed, and filled with about 80% of the solution. A cap is placed on the cuvettes and is wiped with kimwipe to avoid any mishaps. After preparing the diluted solutions, a solution of copper sulfate from solid was prepared. This was done by using an analytical balance and a weigh boat. 0.0750 to 0.4000 grams of copper sulfate pentahydrate was weighed out and added into a clean 25 mL volumetric flask. Then, 10 mL of deionized water is added and swirled to dissolve the solid. Next, a cuvette was rinsed with the solution then was filled about 80% of the cuvette with the same solution. A cap is placed is wiped with kimwipe. Lastly, the spectrophotometer is used to measure the absorbance and transmittance of the solutions. The blank cuvette is placed first to calibrate the spectrophotometer. then , the undiluted copper sulfate sample solution is placed and data is collected. Then, the data for the 3 diluted solution is collected and recorded. After all data is recorded and collected. All equipment is cleaned and put away for next use. The major results of this experiment is that dilution 1 of 50 % of the solution proved to be most concentrated at 0.05 nm, although the stock solution had the most absorbance at lambda max of 1.331.
For experiment 5, the purpose of this experiment is to get acquainted with the concept of nanomaterials, spectrophotometry, and Beer’s law by preparing solutions of silver nanoprisms that are used to obtain absorption spectra. Dilutions for one of the nanoprism vials are used to test Beer’s law to obtain the molar absorptivity
The general procedure of this experiment is to carefully prepare four different solutions of silver nanoparticles. After cleaning out all glassware with distilled water followed by Millipore grade water, the vials are labeled 1-4, and 3 solutions were put into each vial which was: 2 mL of 1.25 x 10^-2 M sodium citrate, 5 mL of 3.75 x 10^-4 M silver nitrate, and 5 mL of 5 x 10^-2 M hydrogen peroxide. After all the solutions are added to each vial, each solution is given different amounts of sodium bromide to differentiate each vial to create different colors. V...


Lab report 4 - chocolate cookie experiment - Prevention 1 - Lab report

450 words - 2 pages Lab Experience Report Format Prevention I 111-114 AB Lab # & Title Name: Karnik Patel ( Lab 3 - Chocolate cookie experiment pH=7.0 ) Date: September 21, 2018 Objective: (1) Why are you doing this? Point form. · This

reformation of copper through the copper cycle - texas a&m university; Chem lab 111 - essay

1073 words - 5 pages Reformation of Copper Through the Copper Cycle Authors: Lauren Yarborough* and Alex Farish; Chemistry 112 Section 505. Introduction: Copper is a very important element due to both its chemical and physical properties but has its down sides when it comes to being earth-friendly. Since copper isn’t biodegradable, it just accumulates over time. In this experiment, both my lab partner and I looked at the chemical reactions of copper as it underwent

Lab Report - Sunflower Oil Experiment - Northwestern Geography 101 - Geography Class Experiment

2349 words - 10 pages mechanism different to that responsible for its inhibition at lower concentrations (5 ml/kg). Previous studies have shown that vegetable oils, including sunflower oil, cause eggs to die before they hatch through mechanisms that are not yet understood, where the oil appears to disintegrate and dissolve the eggs over time 7. This suggests that the experiment may have been limited by its one-week duration overlooking this phenomenon. However, this one-week

Paper on water cup inversion experiment - Grade 10 Science - Lab Report

673 words - 3 pages temperature which was 21 degrees celsius. 4. Measured 10 mL of tap water using a graduated cylinder, then poured it into cup. 5. Placed one sheet of photography paper on the top of cup. 6. Placed one hand on top of paper and the other underneath the cup. 7. In one motion, inverted the cup and held the paper close to the rim of cup. 8. Hand was slowly removed while paper was held in place. 9. Timer was started as soon as hand was removed. 10. Timer was

deforestation and watershed lab report - science-grade 9 - lab report

3241 words - 13 pages and explained. 3. whether nor not cutting all of the trees in a watershed increase water flow over the short ``````term was explained. 4. On the same graph, the remaining data was plotted for both forests from 1970 to 1988. 5. Five years of data points were extrapolated. Results: After plotting the points on my graph, and observing them thoroughly, I found that the waterflow was much larger in the clear-cut watershed. This was

Anatomy and Physiology Lab report - BSC 250L - Lab report

1770 words - 8 pages room to be completely filled with the fresh smell. I will do the same for all three of the rooms and record my results. In order for my results to be more accurate, I will demonstrate this experiment using three different brands of air freshener. I predict that the Febreze air freshener will spread through the room set at 104 degrees Fahrenheit faster than it would in the other rooms set at lower temperatures. Although the air freshener will

A physics lab report for grade 11 class - physics - report

2395 words - 10 pages …………………………………………………………………………….. 9 APENDICES……………………………………………………………………..…..… 10 i List of Figures and Tables Figure 1 Diagram of the Angle 0 ….……………………………………………………4 Figure 2 Diagram of the Angle 10 …………………………………………………….. 5 Figure 3 Diagram of the Angle 20 ………………………………………………………6 Figure 4 Diagram of the Angle 30 .…………………………………………………….. 6 Table 1 Testing Results………………………………………………………………..…3 ii Introduction The purpose of this lab was to study the

August 8th results report for 1st simulation experiment - stonybrook - research report

508 words - 3 pages the correlator toward the influence of flow. 3. The figure above is the comparison of the R() correlators for different centralities (40% - 50%, 50% - 60%, 60% - 70%). The correlation functions for different centrality show a flat shape which indicates the absence of charge separation signal. Unlike which its orientation is strongly correlated to the reaction plan, is decorrelated with the reaction plane and its orientation randomly fluctuated. As

Physics Lab Report - Pendulums and More - qcc phyics lab - lab report

874 words - 4 pages . Period, there was no significant relationship between the two. Experiment: Equipment: 1) String (approximately 1 meter long) 2) Scale 3) Two bobs (steel and wood) Procedure: The steps we took to complete this experiment were quite simple. First we held the pendulum at a determined distance from its equilibrium state. We then had to let go of it and then take time of how long would it be for it to complete its period. We completed this for 5

Experiment 38 Pre - Lab notes and agenda - University of Texas Rio Grande Valley - Pre-Lab explanation on the process.

537 words - 3 pages EXP 38: Qua. NH4+, Mg2+, Ca2+, Cu2+ ➢ Experiment 38 · Skip parts A and B (NO FLAME TESTS) · Only doing parts C-F · Start warm/hot water bath in fume hoods incase needed later. · Groups must grab one known/reference solution and one unknown (write letters down) · ▪ One lab partner will do experiment with known/reference solution. · ▪ Other partner will do experiment with unknown to compare with known. · All blanks must be filled out excluding

Cation Lab Report for Chemistry class - Chemistry 151 - Assignment

715 words - 3 pages NH3 to the precipitate and stir. Centrifuge this mixture and decant the liquid into a test tube. Add 6 M HNO3 to the solution from step 4 until it turns acidic in litmus paper. 1. Lab coat, gloves and safety googles 8. 6M HCl 2. Test tubes (4) and test tube holder 9. 0.2M K2CrO4 3. Centrifuge 10. HNO3 4. Hot plate 11. 6M NH4OH 5. Pipet 12. Wash bottle with deionized water 6. Blue litmus paper 13. Unknown sample B 7. 50 mL

Lab report on lakes and health of rivers - AP environmental - lab report

584 words - 3 pages pollution they were. Data Tables/ Charts: Test 1 Test 2 Test 3 Average Temperature 12 Celsius 12 Celsius 11 Celsius 12 Celsius Width 30 feet 42 feet 31 feet 34 feet Depth 16 inches 9 inches 15 inches 13 inches Velocity 1.81 feet/ second 2.22 feet/ second N/A 2 feet/ second pH Level 7 Dissolved Oxygen (DO) 4 ppm % Saturation 42 % Nitrate 5 ppm Phosphate 4 ppm Turbidity 0 JTU Results/ Discussion: After close analysis of the data collected and

chem assignemnt 1for the kids who need it incluidieng those suffering formm asl and ptsd. - st. lawrence chem - Assigneibhme

3740 words - 15 pages Eseb vukbsdjbsd;hsduohi, cvj,sbnsd ilh ilhildvldb lvbsdjklvhb jkbjkdb vjk jbdvjk bgv dbsv bvbnbxcnbv sdujdjbvjsd kb jsdba vjbdv kjba smwv euilfgs jkbdhsgbdvuebuig djbeufguidgh bjhsebjkfb sebvjksdbv jkbvukdb vjkjvbjld klsdhvjkldihsdvl;sdbsdb nxklm, hjcx, m, ww a, md m j,m,bvjbsdvc jmbjkbsdvm vdm bvklsdbsd bmxcjbsdvbd mcjklbsdfjbsdklbdj,xcbjklsdv xcj, sd vdb jvb sd Eseb vukbsdjbsd;hsduohi, cvj,sbnsd ilh ilhildvldb lvbsdjklvhb jkbjkdb vjk jbdvjk bgv

Comparison of Strength and Power - Exercise Physiology - Lab Report

1425 words - 6 pages per second. This is executed by extending the knee as powerfully as possible, instantly followed by knee flexion of the same intensity (Duhig, Williams, Minett, & Shield, 2016). Results The Wingate Cycle Ergometer, Vertical Jump, Timed Sprints and Isokinetic Dynamometry measurements for each subject are displayed in Figures 1, 2, 3, 4 and 5 respectively. Figure 6 then displays the correlation coefficient between each form of measurement. The data

Extraction of benzoic acid and benzocaine - Organic Chemistry - Lab report

663 words - 3 pages Extraction In this lab, extraction was used to separate and purify a mixture of benzoic acid and benzocaine. For a successful extraction process to occur the liquids must obtain the following properties. The liquids being used must be insoluble when mixed together therefore forming layers, acquire different densities to allow separation, have different solubilities, and the liquids should not react with the compounds to allow isolation of the