Question

60 min Table 1: mass of potato cores in various NaCl solutions NaCl Mass at various time points (g) Concentration (M) 0 min 10 min 20 min 30 min 40 min 50 min 0 5.30 5.50 5.53 5.60 5.67 5.77 0.063 5.37 5.50 5.55 5.67 5.70 5.80 0.13 5.27 5.33 5.33 5.40 5.40 5.43 0.25 5.47 5.47 5.40 5.40 5.33 5.37 0.63 5.53 5.40 5.23 5.13 5.07 4.97 5.73 5.80 5.47 5.37 4.83 ANALYZING THE DATA Calculating percent change in mass of potato cores: Since each potato piece starts at a slightly different mass we can't directly compare mass lost or gained fairly so we need to calculate what percent of the original mass was lost or gained and that percent change can be fairly compared between pieces. Mass (current time)-Mass (zero time) Percent Change in Mass = Mass (zero time) x 100 1. Construct a table (Table 2) to record the percent change in mass for each solution potato sample you are testing. 2. Calculate the cumulative percent change in mass for each time point, for each potato piece, and complete Table 2. 3. Construct a graph (Graph 1) using TAILS. Each solution tested should have a line on the graph, so 5 lines. Each line should have 7 points, one for each time point tested starting with zero. You can do your graph by hand, on graph paper, or on Excel. If you are doing this graph on Excel, display the equations of the lines of best fit on the graph. Insert the graph (or a picture) in your assignment Now you can complete Table 2 and Graph 1 in your assignment.

Answer 1

1, Table

	Mass at various time (Minutes)
NaCl conc (M)	0	10	20	30	40	50	60
0	0	0	0	0	0	0	0
0.063	1.321	0.000	0.362	0.125	0.529	0.520	1.228
0.13	-0.566	-3.091	-3.617	-0.357	-4.762	-5.893	3.208
0.25	3.208	-0.545	-2.351	-0.357	-5.996	-6.932	1.321
0.63	4.340	-1.818	-5.425	-0.839	-10.582	-13.865	-8.868
Cumulative % change	8.302	-5.455	-11.031	-1.429	-20.811	-26.170	-3.112

2, Cumulative change

	Mass at various time (Minutes)
	0	10	20	30	40	50	60
Cumulative % change	8.3	-5.5	-11.0	-1.4	-20.8	-26.2	-3.1

Mass change 10 For O y = 0.6449x For 20 y = -0.8483x For 40 y = -1.6386x For 60 y = -0.4905x For 10 y = -0.3736x For 30 y = -0.1172x For 50 y = -2.0671x 5 4.340 2208 3.208 1.321 0:539 0 0:063: =6:367 -0.13 -0,357 0.25 0.63-0.839 -2.351 -3.617 -5 -4 762 -5.425 5.893 -5.996 -6.932 -8.868 -10 -10.582 -13.865 -15 0 10 20 30 40 50 60 Linear (0) Linear (10) Linear (20) Linear (30) Linear (40) Linear (50) ........... Linear (60)