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My aim for this experiment is to investigate the solubility of salt

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Introduction

Planning My aim for this experiment is to investigate the solubility of salt Prediction Like Hot tea can dissolve more sugar than iced tea, and warm water dissolves less oxygen than cold water. The maximum amount of any solute that can dissolve in a given amount of solvent is called its solubility, and this depends on temperature. The solubility's of gases always decreases with increasing temperature. For liquids and solids, solubility's generally increase with increasing temperature, as is the case with sugar in tea. This should work the same way with hot water and salt the hotter the water the more salt will dissolve. Variables For this experiment I would expect to have dependent variables, which are temperature of water, amount of salt before and after and time for each experiment. Fixed variables, the amount of water being heated, the amount of salt at the beginning and the time for each experiment. ...read more.

Middle

I will make sure that I use exactly 5 grams of salt each time and I will repeate the experiment 3 times to get an average. Safety I will make sure that I wear my glasses throughout the whole experiment to protect my eyes. I will make sure that when I am not using the Bunsen burner I will put it on a yellow flame so that others can see it. Method 100 ml of water were placed in a beaker. Salt was added in 5g lots at each temperature. The solid was stirred in with a stirring rod. When all the 5g had dissolved, another 5g were added. This carried on for 5mins. When there was solid left on the bottom, which wouldn't dissolve, it meant the solution had become saturated. When the solution had become saturated at a particular temperature, the amount desolved was recorded and another temperature was done. ...read more.

Conclusion

I felt that I did a fair test as I made sure that the water was always 100 cubic centimetres, the heat of the water was precise because I made sure I was reading the thermometer correctly, I made sure that I used exactly 5 grams of salt each time and I did 3 experiments for each temperature to find an average. It was also safe because I wore my glasses throughout the whole experiment to protect my eyes. I made sure that when I am not using the Bunsen burner I put it on a yellow flame so that others could see it. I could have improved my experiment by doing more tests at each temperature to find a better average e.g. 5 times, this would have given me more precise results. I could have also have done an experiment for sugar and compared the two experiments, which would have made it more interesting to see which one dissolves quicker. Gary Harrison ...read more.

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Here's what a teacher thought of this essay

4 star(s)

***
This is a straight forward experiment. There is a clear prediction and good diagrammatic description of the method. However, the author does not seem to be very sure about variables, and there are a number of errors in the way the results are presented in both tables and as a graph.

Marked by teacher Adam Roberts 14/10/2013

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