Osmosis Required Practical

Conc. of solution affects mass

What vegetable is used in the Osmosis required Practical

Potato

What is Step 1 of the Osmosis Required practical

Use a cork borer to. cute5 potato cylinders all the same diameter

What are you using to cut 5 potato cylinders all the same diameter

Cork borer

What is Step 3 of the Osmosis Required practical

Before taking the mass, blot + dry before taking mass. Record the length and mass of each potato cylinder

Why should we blot and dry the potato cylinders before taking the mass

To remove the excess water (that can affect mass)

What is Step 4 of the Osmosis Required Practical

Measure 10cm³ of 0.2mol/dm³ salt solution into a boiling tube

How much do you need to measure of the salt solution (that will enter the boiling tube)

10cm³ of 0.2mol/dm³ salt solution

What is Step 5 of the Osmosis Required Practical

Fill the other boiling tubes with 0.4 mol/dm³, 0.6 mol/dm³, 0.8mol/dm³ and distilled water. Add a potato cylinders to each tube

How much salt solution (that will be paired with distilled water) need to be added

• 0.4 mol/dm³

• 0.6 mol/dm³

• 0.8 mol/dm³

How can you remember the volume of salt solutions with distilled water need to be added

Multiples of 2

• 0.4 mol/dm³

• 0.6 mol/dm³

• 0.8 mol/dm³

What is Step 6 of the Osmosis Required Practical

Leave the potatoes for at least 30 minutes

How long did you need to leave theme the Potato cylinder’s in each tube

30 minutes

What is Step 7 of the Osmosis Required practical

Remove the cylinders and blot dry

What is Step 8 of the Osmosis Required Practical

Measure the length and mass of each potato cylinder. Record the changes

What must you measure in the last step of the practical

Length and mass of each potato cylinder

What is the Independent Variable in the practical

Concentration of sugar or salt

Definition of Independent Variable

Thing that changes

What is the Dependant Variable in the practical

Change in mass

Definition of Dependant Variable

Thing you measure

What is the Control Variable in the Practical (5)

• Size of potato

• Volume of solution

• Time

• Temperature

• Same potato

Definition of Control Variables

Stays the same

How do you find the percentage Change

Change in mass / start x 100

How can you prevent an error with measuring mass

Blot the discs before measuring mass