Name: Section: Solubility of Unknown Salts Date: Pre-Lab Questions 1. What is th

Question

Name: Section: Solubility of Unknown Salts Date: Pre-Lab Questions 1. What is the difference between a saturated solution and an unsaturated solution? 2. Briefly explain how the solubility of most salts is related to temperature. What general trend is observed, and why? 3. What factors determine the solubility of a salt in water? Explain. 4. A student collected the following temperature-solubility data for ammonium chloride (NH,CI) dissolved in water: Mass of salt sample: 2.33 g Total Volume of water added 3.00 3.58 4.24 4.66 5.68 6.13 7.06 7.77 Solubility (g salt/ 100 mL H2O) 77.7 Saturation Temperature, °C 98.0 80.0 61.0 51.0 30.0 22.0 10.0 1.0 (a) Calculate the solubility of NH CI for each saturation temperature and enter the values in the table above (b) Prepare a solubility-temperature curve for NH.Cl using Excel. (c) From your curve, estimate the solubility of NH.cl at 40 °C. 15

Explanation / Answer

1. The unsaturated solution can dissolve more solute than is present in the solution. However, in saturated solution the maximum possible amount of solute is dissolved. Hence, the difference between the saturated and unsaturated solvent is that unsaturated solution can dissolve more solute in it. At a given temperature the amount of solute dissolved in a solvent is known as degree of saturation.

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