Use A Calibration Curve To Estimate Water Potetial

Question 1

Describe how you prepare a dilution series by proportional dilution

Answer 1

Calculate volume stock solution
Required concentration/ concentration of stock solution X final volume required
Then subtract stock solution volume from the required volume
Add this much water

Question 2

Describe serial dilution

Answer 2

Make up the first test tube e.g. 10% concentration
Then take 1 cm^3 and add to 10 cm3 water, gives 1% concentration
Repeat each time concentration reduces by factor of 10

Question 3

What must be kept the same about the plant samples?

Answer 3

Uniform:
shape
Size
Surface area
Could be done with a cork borer

Question 4

Give significant control variables in the change in mass of a plant

Answer 4

Temperature 
Same plant
Size/ shape plant
Stock solution
Length of time

Question 5

You have initial masses and the final masses of your plants, why not just use difference to plot on the graph?

Answer 5

You should use percentage change because the samples will have had some variation initially hence the same change in mass would be a more significant change in a lighter sample