Lab Exercise 3B To be completed before beginning week two of the Osmosis and the

Question

Lab Exercise 3B To be completed before beginning week two of the Osmosis and the Scientific Method Lab. 1. The following data were collected during a study of the effect of potassium chloride (KC) solute concentrations on osmosis in a potato core over a period of 60 minutes. Table I: Mass (grams) of potato cores in different concentrations of KCI 40 Minutes 6.5 6.6 5.8 60 Minutes 6.7 6.8 5.6 Minutes 20 Minutes 0% KCI 190 KCI 4% KCI 6.5 solute s in 6.1 ch wa Use the data in Table 1 and the formula for percent change in mass to complete Table 2 a. below. The first two calculations have been done for you as examples. Table 2: Cumulative percent change in mass of potato cores in different concentrations of KCI 60 Minutes 0 Minutes 20 Minutes 40 Minutes 0% KCI 1% KCI 4% KCI Mass (current time point)- Mass (time point zero) Mass (time point zero) liarize X 100 Cumulative % Change the must 63:6.2 x 100= 1.6% 63-62 x 100:0% cution- For 0% KCI at 20 min: For 0% KCl at 0 min: 6.2 6.2 For 0% KCl at 40 minutes: For 0% KCl at 60 minutes: Complete the calculations for l % and 4% KCL 109

Explanation / Answer

for 0% KCl at 40min = 6.5 - 6.2/6.2 = 0.3/6.2 = 0.048 =4.8%

for 0% KCl at 60 min = 6.7- 6.2/6.2 = 0.0806=8.06%

for 1% KCl at 0 min = 6.5 - 6.5 / 6.5 = 0%

for 1% KCl at 20 min = 6.6-6.5/ 6.5 = 0.0153 = 1.53%

for 1% KCl at 40 min = 6.6-6.5/6.5 = 0.0153 =1.53%

for 1% KCl at 60 min = 6.8-6.5/6.5 = 0.046= 4.6%

for 4% KCL at 0 min =6.3-6.3/6.3 = 0%

for 4% KCl at 20 min = 6.1 - 6.3/ 6.3= -0.031 = -3.1%

for 4% KCl at 40 min = 5.8- 6.3/6.3= - 0.079 = -7.9%

for 4% KCl at 60 min = 5.6 - 6.3/6.3 = -0.111 = - 11.1%

b)

1) cumulative percentage change in mass is a dependent variable because its value dependent on the time.

2)Time is independent variable because it is independent of any other value.

3) Yes independent variable is quantitative because it is measured in numerical value.

4) No it is not continuous independent variable because we consider only certain number of value.

5) line graph is nest to use.

6) A line graph consist of a key which shows the event, case and data being measured over time.

Line graphs are helpful in indicating data variables and tendency very distinctly and used to imagine about the outcomes of data not yet recorded. They can also help to show various dependent variables against one independent variable.

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