# Discuss whether all points on the graph were valid. If not, explain why you needed to repeat any measurements.

Report
What follows are minimum guidelines for your lab
report. Be sure to include any additional
information you feel is important or your instructor requires.
Include your data and calculations for density of your known solution and the density and
percent by mass of all of the solutions measured by your te
am members. Record your data and
calculations for the density of the unknown solution. Record the best fit equation, including
the coefficient of determination. Report the mean density (with its standard deviation) and the
percent by mass (obtained fro
m your best fit equation) of the unknown solution.
Include the following in your conclusion:
Summarize the procedure.
Describe the relationship between density and percent by mass for NaCl solutions. Give
experimental evidence to support your conclusio
n.

Explain any discrepancies in the values of the density of the unknown solution obtained by
different members of your team.
Did the volu
me of the pipet used impact the calculated density? Explain. Do you expect the
volume of the pipet used to impact the calculated density? Why or why not?I do not know if you need this part :
Plotting Density vs. Percent by Mass
1.Using your data from Part A and Excel (see appendix A), graph the average density of
each known solution vs. its percent by mass with percent by mass along the x-axis and density along the y-axis. You will use Excel not only to graph the data, but also to determine the best fit equation and the coefficient of determination, R2. The best fit should give a coefficient of determination very close to 1.000. If any points are grossly out of line, repeat the density measurements, enter the new data and run the computer best fit equation determination again.

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