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Laboratory Techniques and Measurements

  1. Rinse the volumetric flask well with distilled

water.

  • Use the serological (graduated) pipet to transfer 2.5 mL of Solution 0 into the volumetric flask.
  • Add approximately 15 mL of distilled water to the volumetric flask containing Solution 0 and swirl to thoroughly mix.
  • Using the short stemmed pipet, continue adding distilled water to the 25 mL mark of the flask.
  • Tare the scale by pressing the Φ/T button so that the scale reads 0.0 g and then place the volumetric flask containing the solution on the scale.
  • Subtract the mass of the dry, empty volumetric flask from the mass of the flask containing the solution.
  • Record the mass of the new sugar solution in Data Table 9 for "Solution 1."
  • Calculate the density of the sugar solution and record in Data Table 9 for "Solution 1."
  • Determine the Final Concentration (% m/v) for Solution 1 using the following equation:
  • Record the Final Concentration of "Solution 1" in Data Table 9 under "Final Concentration."
  • Pour Solution 0 from the glass beaker into the sink and thoroughly dry the beaker.
  • Transfer Solution 1 from the volumetric flask to the dry, empty glass beaker.
  • Repeat steps 20-31 for the remaining 3 dilutions (4.5 mL, 3.0 mL, and 6.0 mL) in Data Table 9.
  • Note: In step 21, transfer the appropriate volume of sugar solutions (4.5 mL, 3.0 mL, and 6.0 mL). Also, use the diluted solution from the previous step as the initial concentration on the next dilution. Do not use the same initial concentration of 32% for all the dilutions.

    1. graph displaying the relationship between Concentration and Density for the sugar solution. The x-axis on the chart will be Density and the y-axis is Concentration. Insert the graph into Data Table 10 of your Lab Report Assistant.

    These are the direct instructions and below is the data table given. I need the blanks filled out to be able to see how the calculations are done. I am confused with the instructions and don't if what I have been doing is correct. Please help.


    help.png

    help.png

    Volume
    Density
    Initial
    Volume
    Final
    Solution
    Mass
    (mL)
    (g)
    (g/mL)
    Concentratio
    Transferre
    Concentratio
    n (% m/V)
    d (mL)
    n (% m/V)
    0
    25.00
    26.8
    1.02
    0.C
    25.00
    25.3
    1.01
    2.5
    2
    25.00
    24.4
    0.976
    4.5
    W
    25.00
    24.1
    0.964
    3.0
    4
    25.00
    23.8
    0.952
    6.0

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