Thermochemistry: an Ice Calorimeter Determination of Reaction Enthalpy

Good Essays
Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy
Curtis M. Franklin
Thursday, February 14, 2013
ABSTRACT
An ice calorimetric measurement was used to determine that a reaction involving solid magnesium metal and 1.00M sulfuric acid produces an experimental a value of ∆H = -226 ± 28 kJ/mol at 0°C. This is about 48.4% lower than the expected value reported at 25°C.

Introduction Many chemical reactions exhibit themselves by exchanging heat energy, either be absorbing heat or releasing it, this heat is energy lost or produced by the system as bonds are formed or broken. These reactions performed under constant-pressure conditions, at 1 atm the energy exchanged is known as the enthalpy change of the reaction. This can be used to measure the potential work energy that a system reaction may possess relative to other reactions and can provide data about the bonding strength of the products and reactants as well as used to predict other reactions that use these products and reactants. A common type of reaction that is chemically assess under laboratory conditions are exothermic reactions, or reactions whose products release heat energy into the environment. They can be ascertained by changes in temperature or by providing energy to molecules. If these molecules are given enough energy they can give visual cues of the reaction strength by changing their phase. Eq. 1 is a predicted as an exothermic reaction, if we can use Eq. 2 as a measurement of its ability to transfer energy we can quantitatively analyze the amount of energy it could possess in its system. Using a technique established in 1783 these properties can be used to measure these heat effects.
Eq. 1
Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g)
Eq. 2
H2O(s) → H2O(l)
Procedure
A method known as isothermal calorimetric analysis can be used to perform a quantitative test of the heat released by certain reactions. These experiments are performed by isolating a system typically in ice and

You May Also Find These Documents Helpful

  • Good Essays

    Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy Shannon Wedepohl 9/17/13 Abstract: During this experiment, an ice calorimeter was used to measure the change in volume in milliliters of magnesium metal and 1.00 M of sulfuric acid. We found the experimental molar enthalpy of the reaction to be ∆H = -370 ± 1 kJ/mol at 0˚C. This compares with an expected value of -466.9 kJ/mol at 25 ˚C, a 20.75% difference. Introduction: Many chemical reactions truly only…

    • 858 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy D. F. Nachman 6/23/2010 Abstract: An ice calorimeter was used to study the reaction of magnesium metal and 1.00M sulfuric acid solution: Mg(s) + H2SO4(aq) →MgSO4(aq) + H2(g). We found the experimental molar enthalpy of reaction to be ΔH = –355 ± 17 kJ/mol at 0°C, 24% lower than the textbook value of ΔH° = –466.9 kJ/mol, reported at 25°C. Introduction Whether a chemical reaction occurs spontaneously or is driven by an outside…

    • 1572 Words
    • 7 Pages
    Powerful Essays
  • Good Essays

    Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy Heidi Moen Chemistry 151 Lab Section No. 47905 09/02/2010 Instructor: John Weide Abstract: In this experiment, an ice calorimeter was used to measure the energy transferred from a system to the surroundings in an isothermal heat transfer. By measuring the change…

    • 818 Words
    • 4 Pages
    Good Essays
  • Better Essays

    F. Nachman Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy 9/11/2014 Introduction: A chemical reaction often indicated by a transfer of energy measured in heat. By measuring this heat transfer in a constant pressurized environment, the enthalpy of the reaction can be used to infer certain information about a specific reactions reactants and products. The transfer of heat from outside sources in would be described as an endothermic reaction. Contrary, when…

    • 633 Words
    • 3 Pages
    Better Essays
  • Good Essays

    Ice Calorimeter Determination with Mg June 18th 2013 Abstract: This experiment determines the amount of energy needed to melt ice. A spontaneous increase in enthalpy produce by combining 0.2036g Mg and 5.00mL H₂SO₄, ice was melted and readings were taken by using an ice calorimeter. Readings were taken before during and after the reaction were completed. The data taken shows a value of -405 KJ/mol while the theoretical value was -483.7 KJ/mol. Calculating the experimental…

    • 580 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Ice Calorimeter

    • 1653 Words
    • 7 Pages

    description of an experimental determination of the enthalpy of reaction of sulfuric acid in a reaction with magnesium to produce magnesium sulfate. Through the use of an ice calorimeter, the rxn H° D for this reaction is determined to be 1 360kJ mol − − × . Introduction: This report details an experiment in thermochemistry. Included are the methods, results, and interpretation of results of an experimental determination of an enthalpy of reaction. The reaction being studied is between sulfuric…

    • 1653 Words
    • 7 Pages
    Good Essays
  • Good Essays

    Determination of Enthalpy

    • 1206 Words
    • 5 Pages

    the Enthalpy of a Chemical Reaction All chemical reactions involve an exchange of heat energy; therefore, it is tempting to plan to follow a reaction by measuring the enthalpy change (∆H). However, it is often not possible to directly measure the heat energy change of the reactants and products (the system). We can measure the heat change that occurs in the surroundings by monitoring temperature changes. If we conduct a reaction between two substances in aqueous solution, then the enthalpy of…

    • 1206 Words
    • 5 Pages
    Good Essays
  • Satisfactory Essays

    Chemistry Internal Assessment 2011 Candy Au Introduction The reaction between zinc and copper (II) sulphate is endothermic. If an excess of zinc powder is added to a measured amount of aqueous copper (II) sulphate in a calorimeter and the temperature change is recorded over a period of time, the enthalpy change of the reaction can be experimentally determined. Assumption 1. Mass of H2O in 100cm3 of CuSO4 solution is 100g 2. Specific heat of solution is 4.18 kJ kg-1 K-1 which is the…

    • 416 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Title : Expt.1 Determination of the enthalpy (heat) of reaction of a monobasic acid with sodium hydroxide Experiment no : 1 Experiment title : Determination of the enthalpy (heat) of reaction of a monobasic acid with sodium hydroxide Objectives: 1) To understand the enthalpy chemistry. 2) To determine the calorimeter constant. 3) To determine the enthalpy reaction of acid-base reactions. 4) To study the exothermic reaction. Apparatus and Materials : * Dewar flask…

    • 1870 Words
    • 8 Pages
    Powerful Essays
  • Better Essays

    Introduction: Thermochemistry is the branch of chemistry that studies the energy and heat associated with chemical reactions and/or physical transformations. A reaction may release or absorb energy, and a phase may change, such as in melting and boiling. Thermochemistry focuses on these energy changes, particularly on the system 's energy exchange with its surroundings. In combination with entropy determinations, it is used to predict whether a reaction is spontaneous or non-spontaneous, favourable…

    • 1551 Words
    • 7 Pages
    Better Essays