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This experiment is to investigate if CaCl2 and Na2CO3 in Distilled Water, Hydrochloric Acid, Sodium Hydroxide, Butanol and Ethanol at room temperature.

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Introduction

Sagar Manilal 15-Nov-2003 Chemistry Lab: Solubility of Solids Aim This experiment is to investigate if CaCl2 and Na2CO3 in Distilled Water, Hydrochloric Acid, Sodium Hydroxide, Butanol and Ethanol at room temperature. Hypothesis This investigation is to see which one of the two solids dissolves in which of the liquids. These solids are CaCl2 and Na2CO3. I find that Na2CO3 may be more soluble in the liquids as the Na is an element that can lose only 1 electron unlike Ca that needs to lose 2. However I find that the difference will be minute since the ionization energies are both in the s-shell. Na has an s-shell missing so it is more likely to lose 1 electron unlike Ca that needs to lose 2. This is difficult for the Calcium as the number of protons remains the same and is having a greater pull on the electrons after losing 1 electron. ...read more.

Middle

Repeat the steps 1-2 with the following liquids: HCl, NaOH, C4H6, CH4COOH. 4. Assemble 10 ml of distilled H2O in a test tube. 5. Then add 0.25g of Na2CO3 into the test tube. Record your observations. 6. Repeat the steps 4-5 with the following liquids: HCl, NaOH, C4H6, CH4COOH. N.B: use different Test Tubes for each experiment. Data Collection H2O HCl NaOH C4H6 CH4COOH CaCl2 (Yes) the CaCl2 dissolved very quickly. (Yes) CaCl2 dissolved in HCl but not as fast as the H2O (No) the liquid turns white and shows that it did not dissolve. (No) the solid is still visible in the test tube. (No) the solid remains in the liquid but doesn't dissolve completely. Na2CO3 (Yes) the reaction occurs fast but still slower than CaCl2. ...read more.

Conclusion

The speed could be another source of error as a stopwatch was not used but a clock in the classroom was. Conclusion To conclude this experiment, it can be suggested that both solids are soluble in different ways. First of all, CaCl2 is more soluble than Na2CO3 in the rate of solubility as the graph show this too. Even though the graph shows the rate of solubility against the temperature CaCl2 is more soluble if speed is taken into account. Na2CO3 is more soluble as a whole in terms of quantity of solubility since Na2CO3 is soluble in 3 different liquids unlike CaCl2 that is soluble in only 2. The aim is to suggest which one of the soluble is more soluble. This is then shown in the Na2CO3 as is dissolves in more liquids. The hypothesis was then proven correct since it states that Na2CO3 is soluble in more liquids than the other solid. ...read more.

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