Osmosis experiment Essay

Osmosis
Trial experiment

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Aim: Our aim in this experiment is to find out which vegetable absorbs the most liquid over a given time due to osmosis.

Chosen Apparatus: we will need to use: six test tubes; a test tube rack; an apple; a potato; a cork borer; a measuring cylinder; sugar solution; scales to measure in milligrams; a ruler; a knife; and a pair of tweezers.

Apparatus
Why we chose it
Advantages
Alternative equipment
apple
Its an absorbent fruit and is similar to a potato
It will show clear differences (if any)
Other fruit such as banana
potato
Its an absorbent vegetable and is similar to an apple.
It will show clear differences(if any)
Other vegetable such as parsnip
Cork borer
It helps us get as close to identical pieces of potato/apple as possible The pieces of fruit/vegetable will be the same diameter
A knife could be used but would not be able to achieve the same diameter for every piece of fruit/vegetable scales
The scales will accurately measure the weight of the pieces of fruit/vegetable Measuring in milligrams to 3 decimal places will provide better A ruler to measure simply length or scales which measure in smaller weights ruler

To get equal lengths of fruit/vegetable
Straight edge
none
Measuring cylinder
Measure out solutions of sucrose accurately
Accurate measurements
none

Independent variables are the different solutions of sucrose, the dependent variable is the change in mass, and the controlled variables include the volume of liquid, the length of each piece, where the test tubes are kept and the time each piece had in each test tube.

Method:
1. using the cork borer, cut 6 pieces of potato and 6 pieces of apple, use the ruler and knife to cut each piece to the same length. 2. Measure the weight of each piece, and place 1 piece in each solution. 3. Wait 24 hours and remove the pieces and measure weight on scales.

Osmosis
Real experiment

Aim: our aim in this experiment is to test which solution of sucrose is absorbed by the potato the easiest.

Chosen Apparatus: we will need to use: twelve test tubes; a test tube rack; an apple; a potato; a cork borer; a measuring cylinder; sugar solution(sucrose); scales to measure in milligrams; a ruler; a knife; and a pair of tweezers.

Number
Concentration of sucrose (%)
Mass before(g)
Mass after (g)
1
0
0.84
0.82
2
20
0.79
0.90
3
40
0.87
0.77
4
60
0.86
0.64
5
80
0.87
0.59
6
0
0.89
1.03
7
20
0.90
0.94
8
40
0.88
0.74
9
60
0.89
0.63
10
80
0.86
0.68
11
100
0.80
0.49
12
100
0.84
0.49

Number 1 is an anomaly because the results suggest it should have gained mass instead of lost mass

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