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    A Level Chemistry Core Practical Sample Teacher Worksheet Acc

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    Chemistry Practical Edexcel

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    A Level Chemistry Core Practical Sample Teacher Worksheet Acc

    Uploaded by

    Web Books
    421 views1 page
    Chemistry Practical Edexcel

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    © © All Rights Reserved

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    PDF, TXT or read online from Scribd

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    Chemistry Practical Edexcel

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    421 views1 page

    A Level Chemistry Core Practical Sample Teacher Worksheet Acc

    Uploaded by

    Web Books
    Chemistry Practical Edexcel

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    EDEXCEL

    Chemistry

    Core practical 1 Teacher sheet


    Measure the molar volume of a gas

    Teacher Resource Pack 1

    Core practical 1: Measure the molar volume of a gas


    Objective

    To find the volume of one mole of carbon dioxide gas

    Safety

    Specification links

    Wear eye protection.

    Core practical 1

    Ensure the delivery tube does not become blocked.

    Practical techniques 1; 4; 11

    Ethanoic acid will sting if it gets into cuts in the skin.

    CPAC statements 1a; 2a; 2b; 3a;


    3b; 4a

    Procedure

    Notes on procedure
    3

    1.

    Place 30cm of 1 mol dm ethanoic acid in the


    boiling tube.

    2.

    Set the apparatus up as shown in the diagram.

    3.

    Place approximately 0.05g of calcium carbonate in


    a test tube.

    4.

    Weigh the test tube and its contents accurately.

    5.

    Remove the bung from the boiling tube and tip the
    calcium carbonate into the boiling tube. Quickly
    replace the bung in the boiling tube.

    6.

    Once the reaction is over, measure the volume of


    gas collected in the measuring cylinder.

    7.

    Reweigh the test tube that had contained the


    calcium carbonate.

    8.

    Repeat the experiment six more times, increasing


    the mass of calcium carbonate by about 0.05g each
    time. Do not exceed 0.40g of calcium carbonate.

    Use of over 0.40g of calcium


    carbonate will result in the volume
    of gas produced exceeding the
    capacity of the measuring cylinder.
    If larger masses of calcium
    carbonate are to be used (such as if
    only a 1 d.p. mass balance is
    available) then a larger measuring
    cylinder will be required.

    Use of a stronger acid will result in a


    faster reaction and so a greater loss
    of gas when the calcium carbonate
    is added to the acid.

    Answers to questions
    1.

    CaCO3 + 2CH3COOH Ca(CH3COO)2 + CO2 + H2O

    2.

    Allows for the mass of any calcium carbonate that remains in the test tube after tipping it out.

    3.

    Gas loss before replacing the bung.

    4.

    Use tube containing the acid inside the vessel containing the calcium carbonate tip to mix the
    reagent.

    5.

    When 0.40g of calcium carbonate is used:


    moles CaCO3 = 0.4 / 100.1 = 0.003996 moles ethanoic acid = c v = 1 30/1000 = 0.03
    moles acid > 2 moles calcium carbonate hence ethanoic acid in excess.

    All users will need to review the risk assessment information and may
    need to adapt it to local circumstances.

    Pearson Education Ltd 2015


    This document may have been altered from the original

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