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CHEMISTRY 220.2 REPORT TEMPLATE rev’d 8/20/09 Density of Sugar Water: Concentration Units for Most Linear Plot

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Date of Experiment

Date Report Submitted

Abstract

The density of sugar water as a function of sugar concentration was examined using different measures of concentration. The known values for the density of sugar water from linearly/nonlinear ly to linearly/nonlinearly sucrose by weight were obtained from the CRC handbook. The density vs. concentration graph was most linear when the concentration was measured in linearly/nonlinearl y. The equation of this line had a slope of linearly/nonlinearly and an intercept of linearly/nonlinear ly. The concentration unit with the poorest linearity was linearly/nonlinearly.

Introduction

The purpose of this experiment is to determine how the density of sugar water changes as the concentration of sugar increases. We expect that the density increases with increasing sugar concentration, but is the increase linear or nonlinear? There are many ways to express

1 concentration, such as weight percent, parts per thousand (ppt), molarity (M), molality (m), and mole fraction (X); does the way that we express the concentration affect the linearity of the plot?

Experimental Method

Describe the procedure you used. Use the past tense.

Raw Data and Sample Calculations

Table 1 summarizes the data used in this analysis, some of which were taken from the CRC

Handbook.

Table 1. Title for table 1 wt % Molarity (M) yours Density (g/ml)

The following equation was used to convert wt % or molarity to title for table 3:

****** In this unprotected section of the document you can add equations and charts. ****** 2 In your equations, use %wt for the weight percent of sucrose, MWs for the molecular weight of sucrose, MWw for the molecular weight of water, ρ for solution density, m for molality, M for molarity, X for the mole fraction of sucrose. Your graphs should always be density vs concentration; that is density on the y axis and concentration on the x axis.

Table 2. title for table 3

correlation coeff, r fit std dev, sy slope and error Density vs wt % ± Density vs M ± Density vs ppt ± Density vs m ± Density vs f ±

Answer the following questions in present tense using paragraph organization. Do the slopes that you determined experimentally agree with literature value? If there are any discrepancies, how can you account for them? Which slope is more accurate?

Conclusions

Literature Cited