Reference no: EM132565611

1.When we repeated the potato core osmosis experiment we obtained the following data. Use this data to (a) create a graph in Microsoft Excel that allows you to (b) estimate the osmolarity of the potato cores (answered in the next question). Your graph should be of % weight change against molarity of the sucrose solutions. Percent weight change is the change in weight (g)/initial weight (g) (times 100). Make sure you plot the independent variable and dependent variable on the correct axes. Your graph should have a title, axis labels, and units where needed.

You should make an x-y scatter graph and then add a line of best fit to calculate the estimated osmolarity of the cytoplasm of the cells in the potato cores.

2.Based on your calculations from the graph you made, what is the osmolarity of the potato? Answer to two decimal places. You should calculate this value and not just guesstimate it from the graph.

Once you have plotted your graph, you will need to figure out how to add a line of best fit to your scatter graph. You then ask Excel to give you the equation for the line. You then solve the equation for x.

For example, if the equation for the graph line is y = 0.5x + 0.211, you rearrange this equation to solve for x. You want to know x when y is 0 (e.g., no change in mass of the potato because no water movement in or out occurred).

3.Imagine all you had was a light microscope, some red blood cells, a 5 M NaCl solution, some distilled water, and a set of twenty test tubes. How might you go about estimating the solute concentration inside a red blood cell? You might like to think about how the experiment with the potato cores was done.

4.Solute 1 cannot pass a semi-permeable membrane, and solute 2 can pass the membrane. Solute 1 has equal concentration on either side of the membrane. Solute 2 has a greater concentration on one side than the other. Do you expect to observe a net movement of water?