Which volume measuring device was more accurate ? Which volume measuring device
ID: 1072083 • Letter: W
Question
Which volume measuring device was more accurate ? Which volume measuring device was precise? Explain your answer. The densities of several water-sodium chloride mixtures arc reported below. On the accompanying piece of graph paper plot the density on the vertical axis and the % by mass of sodium chloride on the horizontal axis. Density and mass percent are not necessarily linearly related. Draw the best appropriate straight line or curve through the data. According to your results and the graph, what is the mass percent of sodium chloride in your unknown?Explanation / Answer
the plot of mass of NaCl vs density is shown below.
the equation of best fit is density = 0.007* mass % of NaCl +0.998
when density is 1.072 g/ml, 1.072= 0.007* mass % NaCl +0.998
mass % of NaCl = (1.072-0.998)/0.007=10.57%
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