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Investigate the solubility of table salt (NaCl) in distilled water at different temperatures.

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Introduction

Chemistry Dmitri Ramzaitsev Lab Report - The Solubility of Solids 14.11.03 11B Aim The aim of this lab is to investigate the solubility of table salt (NaCl) in distilled water at different temperatures. Hypothesis The temperature of the distilled water should definitely have an effect on the solubility of the salt. The higher the temperature of the liquid the more salt we will be able to dissolve. If the temperature of water goes up the particles should move faster and therefore be able to dissolve more salt. Variables Independent Variable: the temperature of the distilled water. Dependent variable: the solubility of NaCl in distilled water. Control Variable: the amount of distilled water, the pressure, the salt. Materials * Beaker * 50g of salt * 8 test tubes * Hotplate * Distilled water * Stopper * Test tube rack * Scale * Thermometer * Graduated cylinder Procedure 1. ...read more.

Middle

Record the amount of salt that been fully dissolved i.e. the amount of portions before the last one. 5. To improve your accuracy, take the amount of salt fully dissolved previously and add it all at once. Shake the test tube with a stopper to speed the process up. 6. After all the salt has been dissolved, take portions of 0.05g and add them in to see the maximum amount of salt that can be dissolved. Make sure you are patient with the experiment, because the salt will not dissolve quickly once the solution is very saturated. 7. Keep adding these portions of 0.05g of salt until no more can dissolve. This will give you the maximum amount of salt dissolved in 10ml of distilled water at a certain temperature to the nearest 0.05g. 8. Repeat the previous steps 3 times using distilled water at higher temperatures. Raise the temperature of the distilled water by placing the test tube in a beaker with water on a hotplate. ...read more.

Conclusion

in it. The higher I raised the temperature the more salt would fully dissolve in the test tube. The graph also shows this direct proportionality. In this experiment I formed a solution with distilled water being the solvent and salt (NaCl) being the solute. This relationship between temperature and solubility can be explained with the following. Temperature is a measure of the average kinetic energy of the molecules in a substance. Therefore, if the temperature increases the molecules move faster. For something to dissolve in something else, energy is needed. This energy is used to split up the particles of salt and align them up with the particles of the water as shown in diagram. The faster the particles are moving, the more energy they have to break up this ion, therefore more of it can dissolve. Also, the faster they move the more chance they have of colliding with the salt particles from the right angle, therefore it will increase the solubility. ...read more.

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