# Essay on Biology Lab Report Ib Hl Osmosis

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Pages: 8

Biology Lab Report 2
Investigating the phenomenon of Osmosis in plant tissues:
Potato in different concentrations of NaCl

Tutor: Maria Tsaousidou
By Marina Gkritzioudi
Biology Lab Report 2
Investigating the phenomenon of Osmosis in plant tissues:
Potato in different concentrations of NaCl

Tutor: Maria Tsaousidou
By Marina Gkritzioudi

Investigating the phenomenon of Osmosis in plant tissues:
Potato in different concentrations of NaCl

Introduction:
Osmosis is the movement of water molecules through a semipermeable membrane from low concentration to high concentration.
Research Question:
How does the concentration of salt (NaCl) affect the mass of a potato soaked in water (H2O) with different concentrations of NaCl
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Table 3: Average potato mass change in each solution over the course of 35 minutes | | Mass(g)(±0.01) in 0.5% NaCl concentration | Mass(g)(±0.01) in 1% NaCl concentration | Mass(g)(±0.01) in 3% NaCl concentration | Mass(g)(±0.01) in 5% NaCl concentration | Mass(g)(±0.01) in 0% NaCl concentration | Mass (g) change (±0.01) | 0.03 | -0.27 | -0.30 | -0.29 | 0.22 |

When the mass change is a positive number, this means that the mass of the specimen, the potato piece, increased from the initial mass. On the contrary, when the mass change is a negative number, this means that the mass decreased from the initial mass that was first measured before it was submerged in the solution.
In Table 4 the rate at which the mass increases or decreases in the five different solutions is shown. This is calculated by dividing the absolute average mass change of each solution (shown in Table 3) and dividing it by the maximum time used in the experiment, which is 35min. For example, the rate at which the mass drops or increases in the 0.5mol dm-3 NaCl concentration solution is shown by taking |0.03| (Table 3) and dividing it by 35min: |0.03|÷35=8.6*10-4g/min. Table 4: Rate at which the mass increases or decreases. | | In 0.5% NaCl concentration solution | In 1% NaCl concentration solution | In 3% NaCl concentration solution | In 5% NaCl concentration solution | In 0%