Purpose The main objective of this lab is to use qualitative analysis to understand and recognize the chemical properties of certain Group 1 cations, which are Ag+, Pb2+, and Hg2+, and to use their inherent properties to identify whether they are present in an unknown sample. These three particular cations, known as the Silver Group, can be separated and isolated from each other by forming insoluble chloride salts. Introduction Chemistry is an analytical science, which is based heavily on experimentation and observation. The data that can be obtained through experimentation can be separated into two distinct types of data: qualitative and quantitative. Quantitative data deals primarily with numerical characteristics, such as the weight or amount of a particular substance.
One of the important aspects of organic chemistry is being able to take an impure mixture of organic molecules, identify it as a mixture and purify each component. In this lab, we will explore several methods of the identification and purification of organic compounds. As these methods will be used throughout the semester, it is important that you learn how to effectively use these methods. Purpose of Experiment 1. Identify that your Excedrin is a mixture of organic molecules using thin layer chromatography (TLC), melting point (mp) and Proton Nuclear Magnetic Resonance Spectroscopy (1H-NMR).
You can go to the web for flow chart examples. Flow Chart: (3 pts) Based on the physical properties (solubility, density, melting point, etc.) of sand, NaCl (table salt), benzoic acid, and iron filings, prepare a flow chart for the experimental procedure for this experiment and include it in your report in the table on page 2. Then you will be ready to follow the experimental procedures as described in the lab manual. If you make any changes to the experimental procedures, please record these changes below: Flowchart: (complete before
The chemical reaction for this experiment is: 3NaHCO3(aq) + C3H4OH(COOH)3(aq) C3H4OH(COONa)3(aq) + 3H2O(l) + 3CO2(g) sodium bicarbonate + citric acid sodium citrate + water + carbon dioxide Purpose: The purpose of this lab is to show visual evidence of the law of conservation of mass during a chemical reaction. Materials: 1) Plastic beaker 2) Paper towel 3) Effervescent tablet (Alka Seltzer) 4) Access to water 5) Balance 6) Safety goggles 7) Plastic bottle (500mL) with air-tight screw cap Variables: - Dependent Variables: - Independent Variables: Procedure: 1) Pour about 50 mL of water into the beaker. If you get the outside of the beaker wet, dry it using a paper towel. 2) Break the tablet in half. Shake or blow any loose grains off the tablet.
Titration lab report Chemistry unit 3 Abstract In this investigation it was looked at the titration of HCL with NaOH, this is a neutralization reaction that is performed in lab in order to determine an unknown concentration of acid (HCL). In this investigation the moles and concentration of acid as well as the Ph of the solution were find out, the mole of 25ml of HCL was 0.65, concentration was 0.026 and the Ph of solution was 1.58Ph. Introduction Titration is a process to measure the volume of an end product, which is produced by reacting a solution of known concentration with a measured volume of a solution of an unknown concentration. The known concentration solution is called a standard solution, it will be added from a buret to allow measure the amount of solution which is added. The solution that is added by buret also called titrant.
Determination of Iron by Reaction With Permanganate [Document Subtitle] Brianna A., Mary, Maabo, & Zarel Purpose: The purpose of this lab was to determine the mass percent of iron in an unknown compound. Procedure: 1. Weigh out 1g of the unknown with a scale and pour into a clean Erlenmeyer flask. 2. Clean the burette.
Another bottle from the same laboratory is labeled “Compound B (isomer of A).” Compound B also reacts with 1 mol equiv of hydrogen, but yields cyclohexanone after treatment with acidic [pic]. a. Suggest structures for A and B. Answer: b. What was the other product formed in the [pic] oxidation of B?
ABSTRACT: The purpose of this experiment was to determine the rate constants and ionic strengths of the series and to prove the Bronsted relation. In order to do so, known amounts of KI, Na2S2O3, KNO3, EDTA, starch and K2S2O8 were mixed up, and placed in the spectrophotometer until the %T reached 60%, and time was recorded. In the first part of the calculations, for flask 1, 2 and 3, the true reaction rate was calculated using the equation k = (1/∆t) x ([S2O32-]/[Iodine][S2O82-]). Which resulted in values of 2.8878765.66 x 10-3 s-1 , 3.159845 x 10-3 s-1, and 3.079703 x 10-3 s-1, these values are all similar to each other since they contain no electrolyte reacting with the persulfate solution. The apparent reaction rate was calculated using the equation, kapp= (1/∆t) x ([S2O32-]/[S2O82-]) which resulted in apparent rate constants of 5.66 x 10-5 s-1, 6.1958 x 10-5 s-1, 6.0356 x 10-5 s-1.
Enzymes Amylase: | Tracing the Breakdown of Starch | Rashaud Pickering, Ashley Bagnis, Stephanie Alvarado, Elbany Angulo 3614098 Section U-14 | Signature___________________ Abstract An experiment was conducted to find out what the optimal temperature for amylase to break down starch was. An Iodine test was used to find evidence of starch formation. Three drops of iodine were dropped into two sets of spot plates. There were four test tubes that contained human amylase and four test tubes that contained fungal amylase. These specimens were all tested before being placed into their respective ice or water baths.
Chemical kinetics Date: 20th, Aug., 2010 Name: Huang Shiqi A0078026E Email address: sunnyqi0801@gmail.com Class No. : Fr1 Lab partner: Jerome Lime A0073046L Abstract: The stated objectives of the experiment were to determine the reaction orders and rate constant of a chemical reaction, using the method of initial reaction rates and to determine the activation energy from the temperature dependence of the reaction rate based on Arrhenius’ theory. The chemical reaction used was iodide-persulfate reaction. Based on the equation: R = k [I-]n[ S2O82-]m and Arrhenius equation, the orders, rate constant (k) and activation energy can be calculated. The orders of the reaction were 2(n=m=1), k was 0.004174 L mol-1s-1 and the activation energy was 82.577kJ/mol.