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    Boiling Point Determinations for Chemistry Students

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    1) Why is a mixture of ice and water, rather than ice alone, used in calibrating a thermometer?

    2) Why does the boiling point of a liquid vary with the barometric pressure?

    3) What does it mean to say that the normal boiling point of a pure liquid substance is a characteristic property of the liquid substance?

    © BrainMass Inc. brainmass.com December 24, 2021, 10:44 pm ad1c9bdddf
    https://brainmass.com/chemistry/chemical-equilibrium/boiling-point-determinations-chemistry-students-503455

    SOLUTION This solution is FREE courtesy of BrainMass!

    1. A mixture of water and ice is used because the exact temperature of solid ice is difficult to determine. The benefit of using ice and water is that an equilibrium temperature of 0 degrees can be expected for this system and therefore the accuracy of the thermometer can be assessed.

    2. The boiling point of a liquid occurs when the liquid's own vapor pressure is the same as the ambient (surrounding) pressure. If the surrounding pressure is adjusted (increase or decrease in the barometric pressure), then the boiling point will in turn be raised or lowered.

    3. This statement reminds us that each pure liquid substance will have a unique boiling point and this boiling point can be useful for us. For example, if you were presented two unknown, pure liquid substances, one way to begin to try and determine the identity of the liquids would be to determine their boiling points. The experimental results could be compared to known values for pure liquids and narrow down the possible identities of the liquids.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 10:44 pm ad1c9bdddf>
    https://brainmass.com/chemistry/chemical-equilibrium/boiling-point-determinations-chemistry-students-503455

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