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    Chemistry For Engineers - Lab GEN 0103L: 2 Semester AY 2020 - 2021

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    ASDSADDSADSA
    This document provides an overview of Experiment 1 of the Chemistry for Engineers lab, which focuses on basic laboratory techniques. The three main objectives are to learn how to use common lab equipment, become familiar with the metric system of measurement, and convert between metric and English units. The experiment covers using a meter stick, graduated cylinder, thermometer, and laboratory balance to make various measurements. Proper procedures are outlined for making accurate readings and determining volumes, masses, temperatures, and converting between unit systems. Mastering fundamental lab skills is important for success and safety in future chemistry experiments.

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    Chemistry For Engineers - Lab GEN 0103L: 2 Semester AY 2020 - 2021

    Uploaded by

    ASDSADDSADSA
    45 views32 pages
    This document provides an overview of Experiment 1 of the Chemistry for Engineers lab, which focuses on basic laboratory techniques. The three main objectives are to learn how to use common lab equipment, become familiar with the metric system of measurement, and convert between metric and English units. The experiment covers using a meter stick, graduated cylinder, thermometer, and laboratory balance to make various measurements. Proper procedures are outlined for making accurate readings and determining volumes, masses, temperatures, and converting between unit systems. Mastering fundamental lab skills is important for success and safety in future chemistry experiments.

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    Experiment No. 1

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    This document provides an overview of Experiment 1 of the Chemistry for Engineers lab, which focuses on basic laboratory techniques. The three main objectives are to learn how to use common lab equipment, become familiar with the metric system of measurement, and convert between metric and English units. The experiment covers using a meter stick, graduated cylinder, thermometer, and laboratory balance to make various measurements. Proper procedures are outlined for making accurate readings and determining volumes, masses, temperatures, and converting between unit systems. Mastering fundamental lab skills is important for success and safety in future chemistry experiments.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    45 views32 pages

    Chemistry For Engineers - Lab GEN 0103L: 2 Semester AY 2020 - 2021

    Uploaded by

    ASDSADDSADSA
    This document provides an overview of Experiment 1 of the Chemistry for Engineers lab, which focuses on basic laboratory techniques. The three main objectives are to learn how to use common lab equipment, become familiar with the metric system of measurement, and convert between metric and English units. The experiment covers using a meter stick, graduated cylinder, thermometer, and laboratory balance to make various measurements. Proper procedures are outlined for making accurate readings and determining volumes, masses, temperatures, and converting between unit systems. Mastering fundamental lab skills is important for success and safety in future chemistry experiments.

    Copyright:

    © All Rights Reserved
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    of 32

    Chemistry for Engineers – Lab

    GEN 0103L
    2nd Semester AY 2020 - 2021

    Engr. Veronica F. Acosta


    EXPERIMENT NO. 1

    BASIC LABORATORY TECHNIQUES


    Objectives:

    1. To learn the use of common, simple laboratory equipments.


    2. To become familiar with the metric system of measurement.
    3. To be able to convert units from Metric to English system and vice versa
    Discussion
    Chemistry is an experimental science, It depends upon careful observation and the use of good
    laboratory techniques. In this experiment, you will become familiar with some basic operations that will help
    you throughout this course. Your success as well as your safety in future experiments will depend upon your
    mastering these fundamental operations.

    Because every measurement made in the laboratory is really an approximation, it is important that
    the numbers you record reflect the accuracy and precision of the device you use to make the measurement.

    In 1960, an international agreement was reached specifying the particular choice of the Metric
    System of units. In this system the basic units for length, mass and time are the meter, kilogram and second.
    This system of units is also known as the International System of units, or commonly referred to as the SI
    system and is preferred in scientific work.
    Materials and Apparatus
    Distilled water Bunsen burner

    Triple beam balance/electronic balance ruler/meter stick

    250mL beaker pipette

    50 or 100mL graduated cylinder aspirator

    Large test tube ring stand/iron stand

    thermometer iron ring

    wire gauze
    Procedure
    A. The Meter Stick / Ruler

    1. Examine the meter stick/ruler and observe that one side is ruled in inches,
    whereas the other is ruled in centimeters.
    2. Measure and record the length and the width of your laboratory manual
    in both units.
    3. Mathematically convert the two measurements to show that they are
    equivalent.
    A. The Meter Stick/Ruler
    Result:
    A. The Meter Stick/Ruler
    Result:
    A. The Meter Stick/Ruler
    Result:
    A. The Meter Stick/Ruler
    Result:
    A. The Meter Stick/Ruler
    Procedure
    B. Graduated Cylinder
    1. Examine the 100mL graduated cylinder that is calibrated in milliliters.
    2. Fill the cylinder approximately half full with water. Notice that the meniscus
    (curve surface of the water) is concave. The lowest point on the curve is always
    read to record the volume, never the upper level. Avoid errors due to parallax
    effects; different and erroneous readings are obtained if the eye is not on level
    with the scale. Read the volume of the water to the nearest 1 mL.
    3. Measure the maximum amount of water that your largest test tube will hold.
    Record this volume. Make at least three trials.
    Graduated Cylinder
    100 mL
    50 mL
    Result: Volume of a half-filled
    graduated cylinder
    Empty Largest Test tube

    Largest Test Tube filled


    with water
    Results: Volume of Largest Test Tube
    Trial 1 Trial 2 Trial 3
    Procedure
    C. The thermometer and its calibration
    This part of the experiment is performed to check the accuracy of your thermometer. The exercise will show how measured
    temperatures (read from thermometer) compare with the true temperature (the boiling and freezing point of water). The freezing
    point of water is 0 C; the boiling point depends upon atmosphere pressure and is calculated as shown below.

    1. Fill a beaker about half full of distilled water.


    2. Place the beaker on a wire gauze and iron ring and begin heating the water. Periodically determine the temperature of the water
    with thermometer, but be careful not to touch the walls of the beaker with thermometer bulb.
    3. Record the boiling point of water. Using the formula below, determine the true boiling point at the observed atmospheric
    pressure. Obtain the atmospheric pressure from your laboratory instructor.
    Formula:
    Boiling point correction = (760mmHg – atmospheric pressure) x (0.037 C/mm)
    True boiling point = boiling point of water – boiling point correction
    Set – up Iron stand
    How to Use Bunsen Burner
    The thermometer
    and its calibration
    The Thermometer and its
    Calibration
    Result: The thermometer
    Result: Boiling Point
    of water
    Procedure
    D. Laboratory Balance
    Weighing an object on a single-pan balance is a simple matter. Considering the
    inherent sensitivity and the cost of the balance you must be careful in its use.
    Directions for operation of a single pan balance vary with maker and model. Your
    laboratory instructor will explain how to use the balance.

    1. Weigh the water whose volume you measured in part B. First pour the water into a previously
    weighed beaker and record the weight of the water and beaker. Then subtract the weight of the
    beaker to obtain the weight of the water alone.

    2. Place a five peso coin and record its weight.


    The Laboratory Balance
    Beaker
    Result: Mass of beaker
    Beaker and water
    Result: Mass of beaker and water
    Mass of a five peso coin
    Result: Mass of a five peso coin
    REFERENCES
    Elizares, L.M. & Acosta, V. F. (2018) Chemistry for Engineers Laboratory Manual.

    Stoker, H. Stephen (2016). General Chemistry. Andover: Cengage

    Zumdahl, Steven S. (2015). Introductory Chemistry: A Foundation. USA: Cengage Learning Asia Ptd
    Ltd., USA

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