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Our aim is too see how the solubility of a solute changes when temperature has been changed.

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DISSOLVING ASSESSMENT AIM Our aim is too see how the solubility of a solute changes when temperature has been changed. EQUIPEMENT The equipment we will be using is a test-tube, a spatula, a bun, a water bath, a thermometer, a measuring cylinder, and obviously we will need the solute and water to carry out the experiment. PLAN Our aim is to see how many spatulas of a solute it will take to put in water to make it a saturated solution. Our solute will be potassium chloride. The plan is to firstly get all the equipment listed above, once we have done this we can start our experiment. We first of all have to measure out 7.5ml of water in a measuring cylinder; the water then goes straight into a test-tube. Once this is done we have to change the temperature, either to 10oc, 20oc, 30oc, 40oc, or 50oc. When the water is the right temperature we can start to add the spatulas in. The method was to put one spatula of potassium chloride, which was about 0.37g, in the test-tube, with the water, and than put the bun on top and shake it for about ten or fifteen seconds, you will than stop and ...read more.


I predict that if we do not follow these rules than we will get a lot of anomalous results. PREDICTION My prediction is that when the solvent is a higher temperature the water will dissolve more potassium chloride than it will if the water was at a lower temperature. I think this because when anything is heated up the particles inside it move much faster and so if you heat the water up the particles inside it will move around more rapidly. If you add the potassium chloride in when the water is at a high temperature, than the solute will brake down much more faster, and much more of it. I also think that there will be maybe a pattern in the results, I know this because there always is a pattern in the results. OBSERVATION The experiment did work towards the plan. The apparatus was set out properly, and the right measurements of the water were made, which was 7.5ml. SUBSTANCE 10oC 20oC 30oC 40oC 50oC Potassium chloride 6 Spatulas 5 Spatulas 7 Spatulas 8 Spatulas 9 Spatulas As you can see the results do not appear right on the table. ...read more.


in our group we just dumped in on spatula of potassium chloride in the water. So when we put the potassium chloride in the water, we were putting different amounts in. We all had to keep the temperature the same while we were going through the experiment but this was almost impossible to do, even though we did put the test-tube back into the water bath when the temperature decreased. All these mistakes lead to anomalous results. You can tell easily by looking at the table that we weren't very accurate at recording the results. Even though there are many anomalous results you can see easily that the evidence is reliable. If you look at the table and exchange the anomalous number with the correct one you can see a simple pattern in both the preliminary and secondary results. We could make some big improvements to the procedure to make the experiment more fair and accurate. I have already said that we could use more accurate equipment. We could also record more temperatures so we get a better understanding of how many spatulas, more can just 5oc add. Also if everyone in the class did the experiment on the same substance the results will be more reliable because you can work out an average between everyone's results. HAMMAD NAVEED ...read more.

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