I predict that all of the weight would go down and some will go up. I predict that the higher the concentration the heavier the potato will be and the lower the concentration the lighter the potato will be.

To make this a fair test I will keep some variables the same and some different. I am going to keep the following variables the same

• timing
• weight of the potato’s
• Volume of liquid

I am going to change only one this which is the concentrations. I am going to change this because that is what we are investigating the amount of salt in concentration.

Piolot Test

On my piolot test we are going to vary either the length, concentration and time to find the best results to use in our experiment. We have decided we are going to vary the time and concentration. For timewe are going to vary it from 10 mins, 20mins , 30mins and see what time is best to use for our experiment. The concentration we are going to experiment with 0.0% 2% and 4%

The potato weight that we are going to use is 1.00g

The results showed:

This is how I started my experiment but then it went wrong and I was unable to do it. I didn’t really know what I was doing, and by this point I had too little time to do another pilot teat. So we checked other peoples results and found out that 20 minutes was the most surfiant time to use. We are going to show the weight of the potato chips before

Prediction

I predict that all of the weight would go down and some will go up. I predict that the higher the concentration the heavier the potato will be and the lower the concentration the lighter the potato will be.

Final Results

My results that I came up with were:

Analysis

From my graph I can see that when the concentration increases the average weight decreses. This is my trend for the graph when the concentration of salt increases the weight opf the potato decreases.

        If the water is pure water no salt and you place the potato chip in it there is more water on the outside in the cup, rather than in the potato. If the concentration is 4% then there is more water inside the poato rather then on the outside in the cup. Ossmosis is a difussion that only takes place in water. When osmosis happens it goes from a high concentration to a low concentration. It lets it though a semi-permiable membrain with holes in it. E.G.  a sive is a semi-permiable membrain it has little holes in it and lets little things throught it e.g flour but if you put sugar cubes in the sive it want sive them because they want’ fit though the holes.

Salt water.

In the salt water is let out but the salt partical isn’t. The potao chip gets lighter

Pure Water.

In the pure water, water is let out and in to the potato because it fits through the holes. The potato chip gets heavier.

In pure water the water has a high concentration the high concentration of water goes inside the potato which has salt in it and turns to a low concentration.

        In salt water the water has a low concentration and is unable to go in to the poato because the salt particals are too big, but water is let out of the potato this is how it gets lighter.

Evaluation

I found that my expreiment went well. The accreacy on it could have gone better as I wasn’t sure whether I had dried the potato off enough, and it may have still had water excess on it. Which could have swade my weighing as it oculd have made it heavier.The improvements that I could have made on my method were mostly including my accreacy. It couldn’t have been that acreat as I may have measured it wrong. On my method I would definatly say measure the volume carefully and dry off the potato as much as possiable to get the excess water off of it. In my graph I found an anomolie. This is where I have an off figure or point. Like this one:

This is an amonlie. As you can see it doesn’t         codordinate with the other results. The causes for this was that it could have been the last one to be taken out of the test tube and been left in the concentration longer than the others. Or that I dried that potato chip more than the other one. I didn’t come over any amonalies in my experiment.

        The further improvements that I could make to my experiment were probally my to plan out my investigation better and to make sure that I know what I am doing before diving in and not knowing what I am doing. Which them leads to no piolt test but using everyone elses results put together. I used potato

because it was the best semi-permiable that I could find. I thought about using carrots but them I thoguht that potatos were softer and may have more holes in it, which would lead to a better result. Insttead of using salt I could have used many other substances. Like different types of sugar; caster suger, granet sugar, brown sugar.