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Investigation on solubility of different chemicals

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Introduction

INVESTIGATING SOLUBILITY PLAN Aim: My partner and I would like to investigate the solubility of different chemicals when placed into 25cm3 of water. Hypothesis: I think that sugar will be the most soluble chemical. By this I mean that the sugar will be able to dissolve in the water even after 12 spatulas. The Calcium Carbonate will be the least soluble chemical and will not be able to dissolve early in the experiment at spatula number 3. I believe that sugar will be more soluble because, unlike calcium carbonate, physically sugar is not a powdery substance, and calcium carbonate is. Maybe their molecules have a stronger bond which would cause difficulty for the chemical to dissolve. Variables: Independent Variable (input): Our independent variables will be: Calcium Carbonate, Calcium Sulphate, Sugar, and Sodium Chloride. Dependent Variable (output): The mass of the solution, and the solubility of the solution. Controlled Variables: Amount of water in 50cm3 measuring cylinder, volume of the chemical added each time, temperature of water. Materials: Top hand balance(1) ...read more.

Middle

When the chemical becomes a saturated solution, then my partner and I will note the spatula number (explained in step 5) We will continue this procedure for all of our chemicals ( calcium carbonate, calcium sulphate, sugar, and sodium chloride) Safety Hazards: (to be researched prior to experiment) Sugar: None Sodium chloride: None Copper Sulphate: hazardous to the environment, cannot be use in high concentration ( we did not use this chemical due to it's safety hazards) Calcium carbonate: Do not have contact with face or mouth, ensure one is wearing eye protection when using this chemical in any given experiment. Calcium Sulphate: Do not have contact with face or mouth, ensure one is wearing eye protection when using this chemical in any given experiment. Chemical Observations Solubility Calcium Carbonate ( CaCO3) Not colorless, immediately is white. Could not dissolve at spatula number 1 Calcium Sulphate Not colorless, immediately solution is murky white. Could not dissolve at spatula number 1 Sugar Very clear and transparent. Stopped dissolving at spatula number 32 Sodium Chloride At spatula number 5, solution starts to get less clear. Couldn't dissolve at spatula number 7. ...read more.

Conclusion

Sodium Chloride became a saturated solution after 6 spatulas, so at spatula number 7, it became a saturated solution and could no longer dissolve. Modifications to original plan: At first, the experiment of my partner and I was to investigate the solubility of calcium carbonate alone. However, Mrs. Lynch informed us that this experiment was lacking independent variables. So, my partner and I decided to alter our experiment by testing not only calcium carbonate, but calcium sulphate, sugar and sodium chloride in addition. Furthermore, my partner and I were going to measure the mass of our solutions, but we came to the conclusion that the mass was irrelevant and not necessary in our experiment. Evaluation: I think our experiment was not entirely accurate. This is due to the fact that, with some chemicals we were not sure weather or not the solution was dissolved or not, and this judgment affected our data. Moreover, I myself would have liked to investigate the solubility of a variety of solutions rather than only four, but due to the time constraint and the materials available, this was not possible. So, if given the chance, I would do my experiment differently by being more accurate with our observations, and investigating more chemicals. ...read more.

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