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    Cre Lab 4

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    Fahad kamran
    The document describes an experiment to determine the kinetics parameters (reaction order n and rate constant k) of a chemical reaction using the fractional life method. Students make solutions of varying concentrations of sodium hydroxide and ethyl acetate and measure the time taken for the concentration to drop to 40% of the initial value. From the log-log plot of time versus initial concentration, they determine the slope to be 0.1236, giving a reaction order n of 0.8764. Using the fractional life equation, they calculate the rate constant k to be 0.7827. The experiment allows students to apply the fractional life method to analyze kinetic data for this reaction of sodium hydroxide with ethyl acetate.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Cre Lab 4

    Uploaded by

    Fahad kamran
    11 views3 pages
    The document describes an experiment to determine the kinetics parameters (reaction order n and rate constant k) of a chemical reaction using the fractional life method. Students make solutions of varying concentrations of sodium hydroxide and ethyl acetate and measure the time taken for the concentration to drop to 40% of the initial value. From the log-log plot of time versus initial concentration, they determine the slope to be 0.1236, giving a reaction order n of 0.8764. Using the fractional life equation, they calculate the rate constant k to be 0.7827. The experiment allows students to apply the fractional life method to analyze kinetic data for this reaction of sodium hydroxide with ethyl acetate.

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    cre lab 4

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    The document describes an experiment to determine the kinetics parameters (reaction order n and rate constant k) of a chemical reaction using the fractional life method. Students make solutions of varying concentrations of sodium hydroxide and ethyl acetate and measure the time taken for the concentration to drop to 40% of the initial value. From the log-log plot of time versus initial concentration, they determine the slope to be 0.1236, giving a reaction order n of 0.8764. Using the fractional life equation, they calculate the rate constant k to be 0.7827. The experiment allows students to apply the fractional life method to analyze kinetic data for this reaction of sodium hydroxide with ethyl acetate.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    11 views3 pages

    Cre Lab 4

    Uploaded by

    Fahad kamran
    The document describes an experiment to determine the kinetics parameters (reaction order n and rate constant k) of a chemical reaction using the fractional life method. Students make solutions of varying concentrations of sodium hydroxide and ethyl acetate and measure the time taken for the concentration to drop to 40% of the initial value. From the log-log plot of time versus initial concentration, they determine the slope to be 0.1236, giving a reaction order n of 0.8764. Using the fractional life equation, they calculate the rate constant k to be 0.7827. The experiment allows students to apply the fractional life method to analyze kinetic data for this reaction of sodium hydroxide with ethyl acetate.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    CRE Lab Wah Engineering College

    Experiment # 4

    Objection:

    To determine the kinetics parameters (n, k) by using fractional life method.

    Apparatus:
     Batch reactor
     Conductivity cell
    Chemicals required:
     Sodium Hydroxide
     Ethyl Acetate
     Distilled water
    Chemical Reaction:
    Na-OH + CH3COOC2H5 CH3COONa + C2H5OH
    Introduction:
    Fractional Life Method(tf ) :

    The half-life method can be extended to any fractional life method in which the
    concentration of reactant drops to any fractional value F= CA in time tf . The
    CA 0
    derivation is a direct extension of the half-life method giving;

    Thus, a plot of log tf versus log CA0 , will give the reaction order.

    Observations & Calculations:


    TABLE 1: TIME VERSUS INITIAL CONCENTRATION

    1
    CRE Lab Wah Engineering College

    Graph:

    Procedure:
     Firstly set the rpm of peristaltic pump at 14.
     Make up 1L solution of 0.2M, 0.5M, 1.0M, 1.5M, 2.0M of sodium hydroxide and
    ethyl acetate for different runs.
     Switch ON the main power supply on the main switch of batch reactor.
     Set the temperature controller at 25oC.
     Charge the reactor with 0.5L of both reactant solution.
     Adjust the conductivity meter probe inside the reactor and switch it ON for taking
    the
    reading of conductivity.
     Switch ON the reactor agitator and also adjust its rpm, note down the results when
    concentration of reactant drops to any fractional value in time tF
     Switch OFF the main power supply of the reactor and wash it off with distilled
    water.
    Calculations:
    F = 0.40
    Slope = 0.1236
    1-n = 0.1236
    n = 0.8764
    Intercept = ln F −1
    1−n

    k(n−1)

    0.1 = ln F −1
    1−n

    k(n−1)

    0.1 = ln (0.40) 1−n


    −1
    k(n−1)
    0.1 = ln (0.40) 1−(0.8764)
    −1
    k(0.8764−1)

    0.1 = ln (0.40) −1
    0.1266

    k(−0.1266)

    Taking antilog at both side;

    2
    CRE Lab Wah Engineering College

    1.1052 = (0.40) −1
    0.1266

    k(−0.1266)
    k (-0.1266)(1.1052) = (0.40)0.1266 − 1

    k = 0.7827
    Conclusions:
    By performing this experiment we are able to configure about the fractional life
    methods for the analysis of data for a given reaction of Na-OH with Ethyl acetate.
    And able to find out its slope with the help of straight line equations from its graph.

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