4.3: Identification of an Unknown - Data and Report

Organic Chem I, Laboratory Manual , Chem · LibreTexts

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    Name: ____________________ Partner(s): ____________________ Date: ____________________

     

    DATA AND OBSERVATIONS

    Unknown letter/number =

    PART 1: SOLUBILITY OF THE UNKNOWN

    Is the unknown soluble in water?

    If the unknown is not soluble in water, which layer did it form (top or bottom) when added to water?

    PART II: DETERMINATION OF THE DENSITY OF THE UNKNOWN

    Trial 1

    Trial 2

    Trial 3

    Mass of an empty graduated cylinder

    Mass of graduated cylinder and unknown

    Mass of unknown

    Volume of unknown

    Density of unknown

    Show the calculation of the density of the unknown for each trial:

    Trial 1:

    Trial 2:

    Trial 3:

    Show the calculation for the average density of the unknown:

    PART III: DETERMINATION OF THE BOILING POINT OF THE UNKNOWN

    Boiling point of unknown =

    PART IV: IDENTIFICATION OF THE UNKNOWN LIQUID

    Based on the solubility test, density, and boiling point, identify the unknown liquid as one of the knowns from the table in prelab question 3. Provide evidence to support your decision.

    POST-LAB QUESTIONS

    1.) What was the biggest takeaway from performing this experiment?

    2.) Imagine that the unknown liquid was not pure. What would you observe during simple distillation?

    3.) How conclusive are the results of this experiment? What are some additional tests you could run to solidify your identification of the unknown?

    This page titled 4.3: Identification of an Unknown - Data and Report was last modified on Sun, 09 Aug 2026 00:53:11 GMT and is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Saadia Khan.