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The Effect of Water
Velocity on Osmosis
 Karen Ni, Mara Tynan, and Joyce Yan
Hypothesis
• To understand how water velocity
  affects the rate of osmosis.
• As the velocity of the water increases,
  the rate of osmosis will increase.
Introduction
• osmosis- movement of water across a
  selectively permeable membrane from an
  hypotonic to hypertonic environment
• velocity- speed with direction
• acceleration- Δvelocity
• increased height=faster final velocity
• faster velocity=water molecules pass
  through membrane and enter cell faster
Materials              o   tape
                        o   2 meter sticks
o Three eggs
                        o   rubber tubing
o 5% vinegar solution
o Beakers:              o   scissors
  o 2-100mL             o   timer
  o 1-500mL             o   electronic mass scale
  o 4-250mL             o   paper towels
o 100mL graduated
  cylinder
o tap water
o thermometer
o 2 funnels
o cheesecloth
Method
o Eggs deshelled
o For all trials
   mass taken before and after
   volume of remaining water measured
   21oC water
   60s
o Control
   each egg placed in 250mL for 60s
o Experimental
   Egg placed on the funnel with the cheesecloth
     stretch over it.
   Water poured down the tube at different
     lengths (therefore speeds and velocities)
pictures of method
Results: 1.5 m
Trial:   Initial Mass   Final Mass   Difference in
         (grams)        (grams)      Mass (grams)

1        89.7           90.25        0.55

2        82.85          82.9         0.05

3        81.66          81.78        0.12

Average Difference in Mass: 0.24 grams
Results: 1 m
Trial:   Initial Mass   Final Mass       Difference in
         (grams)        (grams)          Mass (grams)

1        90.37          90.6             0.23

2        82.93          83.03            0.1

3        81.44          81.63            0.19


Average Difference in Mass: 0.17 grams
Results: .5 m
Trial:    Initial Mass   Final Mass      Difference in
          (grams)        (grams)         Mass (grams)

1         90.11          90.24           0.13

2         83.01          83.19           0.18

3         81.42          81.63           0.21

Average Difference in Mass: 0.17 grams
Results: O m (Constant)
Trial:   Initial Mass   Final Mass       Difference in
         (grams)        (grams)          Mass (grams)

1        83.65          84.08            0.43

2        82.47          82.75            0.28

3        80.93          81.17            0.24

Average Difference in Mass: 0.32 grams
Graph (With Control considered)
                                                Average Difference of Mass in Different Heights of Water
                                     0.35



                                      0.3
Average Difference in Mass (grams)




                                     0.25



                                      0.2



                                     0.15



                                      0.1



                                     0.05



                                       0
                                            0         0.2    0.4     0.6         0.8              1   1.2   1.4   1.6
                                                                       Height Water was Dropped
Graph (Without Control
considered)
                                         Average Difference in Mass in Different Heights of Water
                               0.3



                              0.25
Average Mass Difference (g)




                               0.2



                              0.15



                               0.1



                              0.05



                                0
                                     0        0.2     0.4     0.6           0.8           1      1.2   1.4   1.6
                                                             Height Water was dropped (meters)
Full Scatter Plot (with trendline)
                                         Difference in Mass over Different Heights

                              0.6



                              0.5
 Difference in Mass (grams)




                              0.4


                                                                                               y = 0.066x + 0.128
                              0.3                                                                  R² = 0.039



                              0.2



                              0.1



                               0
                                    0   0.2    0.4     0.6          0.8          1       1.2             1.4        1.6
                                                     Height Water was dropped (meters)
Analysis
• Averages of difference in mass seemed to
 increase slightly as height increased
  o Individual trials showed that for the highest
    height tested (1.5m) two of the trials in fact
    displayed a lower difference than the
    averages of all three heights
  o One high outlier (0.55 g) skewed average
• Control group exhibited a greater average
 difference in mass than that of all
 heights.
Conclusion
• Data does not support hypothesis
  o Lin-reg T test comes up with a p value of
    0.332
     Above the significance level- not sufficient
      evidence to show that there was a positive
      association between water velocity and rate of
      osmosis.
Errors
• Concentration of water in eggs
• Rubber tubing
• Consistency of pouring water
Improvements
• More trials (10 if possible for each height)
• Greater range of tested heights (maybe
 0.5- 5 m if possible)

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Diffusion egg presentation

  • 1. The Effect of Water Velocity on Osmosis Karen Ni, Mara Tynan, and Joyce Yan
  • 2. Hypothesis • To understand how water velocity affects the rate of osmosis. • As the velocity of the water increases, the rate of osmosis will increase.
  • 3. Introduction • osmosis- movement of water across a selectively permeable membrane from an hypotonic to hypertonic environment • velocity- speed with direction • acceleration- Δvelocity • increased height=faster final velocity • faster velocity=water molecules pass through membrane and enter cell faster
  • 4. Materials o tape o 2 meter sticks o Three eggs o rubber tubing o 5% vinegar solution o Beakers: o scissors o 2-100mL o timer o 1-500mL o electronic mass scale o 4-250mL o paper towels o 100mL graduated cylinder o tap water o thermometer o 2 funnels o cheesecloth
  • 5. Method o Eggs deshelled o For all trials  mass taken before and after  volume of remaining water measured  21oC water  60s o Control  each egg placed in 250mL for 60s o Experimental  Egg placed on the funnel with the cheesecloth stretch over it.  Water poured down the tube at different lengths (therefore speeds and velocities)
  • 7. Results: 1.5 m Trial: Initial Mass Final Mass Difference in (grams) (grams) Mass (grams) 1 89.7 90.25 0.55 2 82.85 82.9 0.05 3 81.66 81.78 0.12 Average Difference in Mass: 0.24 grams
  • 8. Results: 1 m Trial: Initial Mass Final Mass Difference in (grams) (grams) Mass (grams) 1 90.37 90.6 0.23 2 82.93 83.03 0.1 3 81.44 81.63 0.19 Average Difference in Mass: 0.17 grams
  • 9. Results: .5 m Trial: Initial Mass Final Mass Difference in (grams) (grams) Mass (grams) 1 90.11 90.24 0.13 2 83.01 83.19 0.18 3 81.42 81.63 0.21 Average Difference in Mass: 0.17 grams
  • 10. Results: O m (Constant) Trial: Initial Mass Final Mass Difference in (grams) (grams) Mass (grams) 1 83.65 84.08 0.43 2 82.47 82.75 0.28 3 80.93 81.17 0.24 Average Difference in Mass: 0.32 grams
  • 11. Graph (With Control considered) Average Difference of Mass in Different Heights of Water 0.35 0.3 Average Difference in Mass (grams) 0.25 0.2 0.15 0.1 0.05 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Height Water was Dropped
  • 12. Graph (Without Control considered) Average Difference in Mass in Different Heights of Water 0.3 0.25 Average Mass Difference (g) 0.2 0.15 0.1 0.05 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Height Water was dropped (meters)
  • 13. Full Scatter Plot (with trendline) Difference in Mass over Different Heights 0.6 0.5 Difference in Mass (grams) 0.4 y = 0.066x + 0.128 0.3 R² = 0.039 0.2 0.1 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Height Water was dropped (meters)
  • 14. Analysis • Averages of difference in mass seemed to increase slightly as height increased o Individual trials showed that for the highest height tested (1.5m) two of the trials in fact displayed a lower difference than the averages of all three heights o One high outlier (0.55 g) skewed average • Control group exhibited a greater average difference in mass than that of all heights.
  • 15. Conclusion • Data does not support hypothesis o Lin-reg T test comes up with a p value of 0.332  Above the significance level- not sufficient evidence to show that there was a positive association between water velocity and rate of osmosis.
  • 16. Errors • Concentration of water in eggs • Rubber tubing • Consistency of pouring water
  • 17. Improvements • More trials (10 if possible for each height) • Greater range of tested heights (maybe 0.5- 5 m if possible)