Preview

Lab Repor Chemical Kinetics

Good Essays
Open Document
Open Document
2206 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Lab Repor Chemical Kinetics
Abstract

The “Chemical Kinetics” experiment was done to investigate the changes in the rate of reaction under the effect of concentration, temperature, and presence of a catalyst. It was determined that as the concentration of reactants and the temperature increases, the rate of the reaction increases as well. Also, the reaction was run by the presence of catalyst, and the rate of the reaction increased drastically in the presence of it. The order of the reaction with respect to each reactant was calculated to be: x = 1 [I-], y = 1 [BrO3-], z = 2 [H+] by the method of initial rates. The average rate constant was determined to be 26.7 M-3s-1, and the activation energy was calculated to be 49.6 kJ/mol.

Introduction
The whole purpose of this experiment is to deal with the laws of chemical kinetics, and by doing the experiment, compare the experimental results with the theories and see if they were followed. From the kinetics studies, it is obvious that the rate of a reaction increases as the temperature of the reaction increases and as the concentration of the reactants increases. Also, the catalyst increases the rate of the reaction and decreases the activation energy. Thus, this experiment is divided into three sections and the dependence of the reaction rate from different factors is observed step by step.
The idea of the first part of this experiment is to find the reaction orders with respect to each reactant and the rate constant, k. The method of initial rates to calculate the order with respect to each reagent will be used. With different times, the concentrations will vary in each trial. In this experiment, the following type of reaction is considered: aA + bB → cC + dD (1)
The rate law is:
Rate = k[A]x[B]y (2)
The reaction that occurs between the iodine ion and bromate ion will be studied, which is as follows:
6I-(aq) + BrO3-(aq) + 6H+(aq) > 3I2(aq) + Br-(aq) + 3H2O(1) (3)
Then, the rate of the reaction is concluded to be:
Rate =

You May Also Find These Documents Helpful

  • Good Essays

    CHEM 1252 Lab Report 5

    • 1825 Words
    • 21 Pages

    The purpose of this experiment was to determine the differential rate law for a chemical reaction based on the relationship between the concentration of reactants and the rate of reaction. Since spectrophotometers, like Spec-20s, provide information about concentration, these instruments were used to monitor the increase or decrease in concentration of a reactant in a solution over time. By plotting [phph2-] versus time and changing the concentration of OH- used, the order of the reaction with respect to each reactant and the overall order of the reaction can be determined.…

    • 1825 Words
    • 21 Pages
    Good Essays
  • Satisfactory Essays

    AP Chemistry Kinetics Lab

    • 335 Words
    • 2 Pages

    The purpose of this lab is to learn how to write law expressions, determine orders by graphs, and calculate rate constants. By determining the number of drops of sodium hypochlorite necessary to make a diluted food dye change to colorless in less than three minutes helps calculate the absorbance which can then be analyzed to find the pseudo rate constant and eventually leading to the rate constant and the rate law. The results show that the m and n are both 1st order which makes the overall order of the blue dye 2nd order.…

    • 335 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    The predicted reactivity of the five hydrocarbons in free-radical chain bromination in increasing order was ethylbenzene (9), toluene (8), methylcyclohexane (13), cyclohexane (12), and tert-butylbenzene (11). This hypothesis was a result of the fact that benzylic hydrogen atoms react faster than aliphatic hydrogen atoms and aliphatic hydrogen atoms react faster than aromatic hydrogen atom atoms. The hypothesis was in fact correct and the reaction times of each hydrocarbon with different hydrogen atoms in the bromination experiment support…

    • 869 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    The objective of this laboratory experiment is to observe and record the effect of reactant concentration, reactant surface area and reactant temperature on the overall rate of reaction.…

    • 2334 Words
    • 8 Pages
    Powerful Essays
  • Powerful Essays

    Crystal Violet Formal Lab

    • 2472 Words
    • 10 Pages

    Introduction: Kinetics, which is the study of how fast a reaction takes place or in other words the rate of a reaction, is the main ideology in this experiment. Reaction rates can be measured in a number of ways: by monitoring the amount of product formed, by measuring the loss in mass of reactants, for reactions involving gaseous products measuring the volume of gas produced, by electrolytic conductivity, pH measurement or for colored reactants or products measuring the transmittance by the use of a colorimeter. In this experiment the last method of measurement is used which is colorimetry.…

    • 2472 Words
    • 10 Pages
    Powerful Essays
  • Good Essays

    The order of a reaction is defined as the exponent to which the concentration term in the rate equation is raised, and is found through experimental trials. The total order of a reaction is determined by finding the sum of the individual orders of the reaction. The order of a reaction can be found using several methods, one being the measurement of the appearance over time of a coloured species. The progressing appearance of the coloured species is plotted as a function of time.…

    • 1906 Words
    • 6 Pages
    Good Essays
  • Good Essays

    The purpose of this experiment was to study the different types of chemical reactions using physical and chemical properties and balanced chemical equations. There are four different types of chemical reactions decomposition reactions, single displacement reactions, synthesis reactions, and double displacement reactions.…

    • 562 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Chem Lab Report

    • 393 Words
    • 2 Pages

    The purpose of the lab was to determine the order of reaction for the dye Red #40. By measuring the reaction rate between bleach and the dye, the order of the reaction was determined to be first order.…

    • 393 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Chemical Reactions Lab

    • 1135 Words
    • 5 Pages

    Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.…

    • 1135 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Reaction Order and Rate Laws

    • 2460 Words
    • 10 Pages

    Abstract: When combining compounds, there are always two roles considered in the reaction. These are reactants and products. Reactants are the initial compounds before mixing. The products are synonymous with the term byproduct, or what remains when the reaction occurs. For example, Sodium (Na+) and Chlorine (Cl-) are mixed to create Sodium Chloride (NaCl) . In this example, sodium and chlorine are the reactants and sodium chloride is the product. The use of rate laws expresses the rate of a given reaction to produce a concentration of a reactant in a given chemical reaction such as described with sodium chloride. This is important because the use of rate laws can be used to calculate how much of a reactant is used and how quickly a reaction occurs based on the level of concentration of the reactants. Knowing this, chemists can speed up or slow down reactions which is useful if the initial reaction time is extremely long or requires an exorbitant about of products to produce the desired results in the reaction.…

    • 2460 Words
    • 10 Pages
    Good Essays
  • Powerful Essays

    X= concentration of diacetone alcohol , t=time , k=rate constant, n+m= order of the reaction…

    • 4204 Words
    • 17 Pages
    Powerful Essays
  • Good Essays

    Kinetic Reaction Lab

    • 719 Words
    • 3 Pages

    One application of the study of kinetics can be applied to the determination of the rate of a chemical reaction involving a certain selection of chemicals (FD&C Blue #1 and sodium hypochlorite). The purpose of the proceeding experiment is to make such a determination, as well as determining the rate law for the reaction by establishing the rate constant and concentrations and reactions orders of the chemicals.…

    • 719 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    The purpose of laboratory assignment 3 was to measure the rate at which a chemical reaction takes place. For the purpose of this lab we measured the rate a balanced oxidation/reduction reaction between iodine, hydrogen, and bromate ion occurs. The above reaction occurs slowly so we used a coupled iodine clock reaction to measure the rate of the oxidation/reduction reaction because it occurs much faster but is still dependent upon the other reaction. To accomplish this, two mixtures were prepared in separate Erlenmeyer flasks. In the 250 ml flask .010M potassium iodide, .0010M Sodium thiosulfate and distilled water was prepared. A 125 ml flask was also prepared with a mixture of .040M potassium bromate, hydro chloric acid and…

    • 253 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Reactants Lab

    • 1408 Words
    • 6 Pages

    This experiment was done to determine the effects of the nature of the reactants, concentration, temperature, surface area and catalyst on the rate of chemical reactions. The nature of the reactants implies a difference if the reactants are aqueous or organic, acidic or basic or if they occur in the same phase or not. Acid-base reactions, formation of salts, and exchange of ions are fast reactions while reactions in which large molecules are formed or broken apart are usually slow. Generally, the rate of reaction is directly proportional to the concentration of the reactants, as well as to the temperature. Greater surface areas and addition of catalysts also increase the rate of chemical reactions.…

    • 1408 Words
    • 6 Pages
    Powerful Essays
  • Good Essays

    The purpose of this experiment is to distinguish the relationships between reactants and products, in addition to expanding on concepts such as single displacement reactions, mole ratio values, moles to mass, theoretical yields, limiting reactants, excess, stoichiometric relationships and percentage errors.…

    • 1020 Words
    • 5 Pages
    Good Essays