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Chemistry 220.2 Report Templaterev’d 8/20/09Density of Sugar Water: Concentration Units for Most Linear PlotName FORMTEXT Your name hereLab Partners’ Names FORMTEXT Your partners' names hereDate of Experiment FORMTEXT ?????Date Report Submitted FORMTEXT ?????AbstractThe 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 FORMTEXT lowest % to FORMTEXT highest % sucrose by weight were obtained from the CRC handbook. The density vs. concentration graph was most linear when the concentration was measured in FORMTEXT most linear concentration. The equation of this line had a slope of FORMTEXT slope ± error and an intercept of FORMTEXT intercept ± error. The concentration unit with the poorest linearity was FORMTEXT least linear concentration.IntroductionThe 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 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 FORMTEXT Describe the procedure you used. Be concise, use the past tense, and use the passive voice.Raw Data and Sample CalculationsTable 1 summarizes the data used in this analysis, some of which were taken from the CRC Handbook. Table 1. FORMTEXT Insert title for table 1. (“yours” is either molality or mole fraction.) wt %Molarity (M)yoursDensity (g/ml) FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ????? FORMTEXT ?????The following equation was used to convert wt % or molarity to FORMTEXT molality or mole fraction:****** In this unprotected section of the document you can add equations and charts. ******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. FORMTEXT Insert title for table 2. You'll need information from the other group! correlation coeff, rfit std dev, syslope and errorDensity vs wt % FORMTEXT ????? FORMTEXT ?????± FORMTEXT ?????Density vs M FORMTEXT ????? FORMTEXT ?????± FORMTEXT ?????Density vs ppt FORMTEXT ????? FORMTEXT ?????± FORMTEXT ?????Density vs m FORMTEXT ????? FORMTEXT ?????± FORMTEXT ?????Density vs f FORMTEXT ????? FORMTEXT ?????± FORMTEXT ????? FORMTEXT Answer the following questions in present tense using paragraph organization. Which graph appears to be the most linear? Which appears to be the least linear? Does the correlation coefficient confirm your visual inspection of the graphs? Or do you have to have the correlation coeffiencient to know which is the best? Does the relative error of the slope give any indication about which fit is most linear?Conclusions FORMTEXT Which model is the most linear, and is any linear model satisfactory? The answers to these questions consitute your claim. Make you warrant explicit, and refer to the data from the table and statistical analysis for your grounds. Would you feel confident saying that any of these measures of concentration produced a truly linear relationship with density? If you had to use these graphs as a calibration curve, that is, if you had to measure the concentration of a sugar solution by measuring its density and then comparing it to a graph, would you be confident that you would get a good value of the sugar concentration? You don't have to pick a linear model to use a calibration curve--which is the best calibration curve? Why? Literature Cited FORMTEXT List the reference sources you used to find the accepted values for the density of sugar solutions. Also list the sources for your equations. Also list any references for the procedure you followed in graphing or analyzing the data. ................
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