# Water lab report hl bio ib

In order to improve the results of this experiment, it is necessary that some changes be made. After 15min take each of the pieces out of the beakers and measure its weight and record it.

Rate at which the mass in each solution increases or decreases Conclusion: The data collected confirmed the hypothesis that that the solute with the highest concentration of salt will cause more mass loss to the pieces of potato, the pieces that will be placed in the solute with the lowest concentration of salt will have small weight loss, and the pieces that will be placed in water NaCl concentration 0 will gain weight thus increasing in mass.

Potato in different concentrations of NaCl Introduction: 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.

This is calculated by subtracting the initial measurement of the average mass of the pieces of potato measurements of 0min shown in Table 2which are submerged in different solutions with different salt concentrations, from the final measurement of the mass of potato present in the same concentration measurements of 35min shown in Table 2.

This is calculated by subtracting the average initial mass measurement from the average final one, dividing it by the average initial mass and multiplying it by If we submerge a plant in water with no NaCl dissolved in it, the mass of the plant will increase, because water molecules will move from the low concentration solute to the high, thus entering the plant tissue and increasing its mass and weight.

The information in the table was a result of adding the measurements from both of the trials, at a specific time, and dividing this sum by two.

Record the initial mass of the potato pieces and place 2 potatoes in each beaker. Thirdly, the timer that was used was the classroom clock and therefore the time at which the pieces or potato were measured were not very accurate.

The pieces that will be placed in the solution with the lowest concentration of salt will have small weight loss. Secondly, the sizes the potatoes were chopped in were not exactly the same because more attention was given to having the same mass and thus neglecting the size which leads to different surface to volume ratio and affects the results.

Repeat Step 7 after 30min and after 35min in order to get the rate at which the mass changes. Start by measuring 0. Rate at which the mass increases or decreases. Lastly, from the first graph it can be estimated that at concentration 4. A proper timer should be used to count the time intervals. It is expected that the solution with the highest concentration of salt will cause more mass loss to the pieces of potato.

Lastly, the volume of the water solutions should be the same in all beakers so that the osmotic effect will only depend on the concentration dissolved in the solution.

After observing the changes in the mass of the potato pieces we can tell that the higher the concentration of salt in the water, the more the mass of plants will decrease because of osmosis. Osmosis is the movement of water molecules through a semipermeable membrane from low concentration to high concentration. Measure each one of the 10 pieces and in order to equalize their mass chop, or scrape off some of the piece if needed.

How does the concentration of salt NaCl affect the mass of a potato soaked in water H2O with different concentrations of NaCl over the course of 30 minutes? Also, time wise, the more the plant specimen soaks in the solutions the more its mass will relatively increase or decrease. In Table 4 the rate at which the mass increases or decreases in the five different solutions is shown.

Firstly, a tool should be found that will allow potato pieces to be chopped in the same size so that the surface to volume ratio will be the same and not change, thus affecting the results. There are some limitations to this experiment that prevent the results from being perfect.

Place the watch glass on the weigh balance and after zeroing it, measure four different concentrations of salt by adding it with the spatula. For example, in the 5mol dm-3 NaCl concentration the mass g after 35min was 1. 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.Hydrogen bonding, the properties of water and its use in living things.

This lesson uses a screen cast to introduce a simple diagram of hydrogen bonding in water. There are a range of activities to help student to understand how these hydrogen bonds affect the properties of water and how this affects living things. IB Biology Higher Level Lab Report Title: Weigh g of baking soda and mix it in mL of water in beaker number 1, stir with the stirring rod. 4.

Mix a squirt of soap with mL of water in beaker number 2, also stir with the stirring rod. 3 5. Using the plastic pipette, add one drop of the diluted soap solution in beaker 1 into beaker. IB Bio lab report on photosynthesis Words | 7 Pages follows; 6H₂O + 6CO₂ C₆H₁₂O₆ + 6O₂1 There are four variables that affect the rate of photosynthesis; light intensity, temperature, CO₂ and water.2 However, is it possible to count in the colour of light, too, which I am going to investigate in this lab.

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