25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the equation: Na2CO3 + 2HCl → 2NaCl + CO2 + H2O 6. 25 cm3 of a sample of vinegar (CH3COOH) was pipetted into a volumetric flask and the volume was made up to 250 cm3. This solution was placed in a burette and 13.9 cm3 were required to neutralise 25 cm3 of 0.1 moldm-3 NaOH. Calculate the molarity of the original vinegar solution and its concentration in gdm-3, given that it reacts with NaOH in a 1:1 ratio.
Experiment 8 : Ramen Spectroscopy Objective: To utilize Raman Spectroscopy as an analytical chemistry tool to determine (i) the composition of an unknown chloroform/benzene mixture (ii) the amount of ethanol in vodka. Pre-lab questions: 1) What is a calibration curve and how would you go about constructing one? A calibration curve shows the response of an analytical method to known quantities of an analyte. To construct a calibration curve, we first prepare known samples of the analyte covering a range of concentrations expected for the unknowns and measure the response of the analytical procedures of these standards to generate signal data. After the measurement is done, a linear graph of the signal data against analyte concentration is plotted.
pKa of a Weak Acid Introductory Chemistry 1120 pKa of a Weak Acid 1. A results section for the pKa lab. See the example results section from the chemical equilibrium experiment and the details of a results section on page xi of your lab manual. On this table shows the volume of the titration. Unknown acid buret | | | | Trial #1 | Trial #2 | Initial buret reading | 20.5 mL | 21.8 mL | Final buret reading | 40.5 mL | 45.1 mL | Volume of acid added | 20.0 mL | 23.3 mL | This second table shows the calculation of the pH at half equivalence point, average pKa and the average of the unknown acid.
Materials and Methods In this experiment, there are three main parts and a variety of chemicals required to achieve a desired result. The first step for this experiment was for the student to gather the necessary materials. Vials of each type of transition metal, Fe3+, Co2+, Ni2+, Cu2+, and Zn2+, as well as solutions of 6M HCl, 1.5M HCl, 15M NH4OH, 3M NH4OH, 3M HCl, dimethylglyoxime in ethanol (DMG), and the unknown sample. Materials needed include two pieces of chromatography paper, three 600mL, two spot plates, tongs, six capillary tubes, foil, and an ammonia fumigation chamber. This experiment had two main phases, identification of transition metals and paper chromatography.
Pressure Temperature Relationships in Gases Abstract The purpose of this experiment was to determine the pressure, temperature properties of a specific volume of liquid. This experiment developed our understanding between the temperature of gas and the pressure it exerts. Materials used in this experiment were LabQuest, Vernier Gas Pressure Sensor, Temperature Probe, ice, hot plate, 125 mL Erlenmeyer flask, ring stand, and plastic tubing with two connectors. We measured pressure and temperature for ice (92.90 kPa and 273.7 K), room (100.91 kPa and 294.9 K), boiling (124.01 and 368.1 K), and warm (110.01 kPa and 322 K). Introduction When a substance is in the gas state, its molecules are very spread out and are in constant motion.
Trang Nguyen Lab Report Chemistry 162: Reaction Kinetics Lab The purpose of this experiment: In this experiment, students aim to determine the rate law of the reaction by finding the time for each trial of different runs occurring. Upon studying initial reaction rates at varied reactant concentration, students will give out conclusion about the effect of the concentration towards the reaction rate. Next, the effect of the metal ion catalyst on the reaction rate will be studied by adding a dilute Cu(NO3)2 to the reaction. Finally, students will determine the effect of temperature on the reaction rate by carrying out the reaction at different hot and temperature, then calculate the activation energy. The procedure: Cabasco-Cebrian, T.; Loftus, C.; Schulz, J.; Villarba, M.; Wick, D. “Lab Manual for CHEM 162” Winter 2011, Department of Chemistry, Seattle Central Community College, pp.
Acid-Base Titrations Chemistry Quick Review of an Acid-Base Titration Calculation By Anne Marie Helmenstine, Ph.D., About.com Guide See More About: * titration * calculations * study sheets * acid-base reactions Ads Analytical InstrumentsGC, HPLC, LCMS, Microplate Readers Refurbished Laboratory Instrumentswww.conquerscientific.com Chemistry course in ukGet a Degree in Chemistry from a UK University. Free expert advice.www.click-courses.com/Chemistry Litmus paperRed, blue and neutral paper in books and reels manufactured in UKwww.johnsontestpapers.com Chemistry Ads * Chemistry com * Chemistry * Chemistry Help * Chemistry Experiments * Concentration Problem An acid-base titration is a neutralization reaction that is performed in the lab in order to determine an unknown concentration of acid or base. The moles of acid will equal the moles of base at the equivalence point. Here's how to perform the calculation to find your unknown. For example, if you are titrating hydrochloric acid with sodium hydroxide: HCl + NaOH → NaCl + H2O You can see from the equation there is a 1:1 molar ratio between HCl and NaOH.
Purpose: The purpose of this lab is to prepare and purify a fuel, ethanol C2H5OH. We will learn to do so by the process of fermentation, and distillation. Over the course of 2-3 weeks, we will be collecting and analyzing the data for this lab. Hypothesis: If the alcohol ferments correctly, then 75% alcohol will be produced with a volume on 150 mL out of the initial 200 mL solution. Procedure: Refer to Chemistry Lab Manual pp.
Name General Chemistry 1411 Laboratory Techniques and Measurements May 16, 2013 Professor Frank Pishva Objective/Purpose: The objective of this lab, laboratory techniques and measurements is for us the student to learn about the unit systems and how it relates to measurements in mass, length, temperature, and volume. This lab purpose is to also help us learn how to combine units to determine density, conversions, and trying to become familiar with common laboratory equipment and techniques. Hypothesis/Theory: This lab is pretty self-explanatory. The only theory that could possibly occur is on data table 9, understanding the dilution process. As the dissolved sugar volume transfer increased, the mass will stay approximately the same due to the density of the water decreasing as the sugar water become less diluted.
Place temperature probe through hole in cardboard lid and position probe about 1cm above bottom of calorimeter 15. Obtain an exact mass of hot water (~50mL) d. Should be approx. 45-60C above room temperature 16. Record temperature of cold water and hot water immediately before mixing the two. 17.