Solubility Curves Essay

1347 words - 5 pages

Purpose: To determine the solubility of potassium nitrate in water at different temperatures to be able to construct a solubility curve for potassium nitrate.Procedure:1.Labelled 5 test tubes A, B, C, D and E2.Filled each test tube with 5 ml of distilled water.3.Placed 7.5 g of potassium nitrate in test tube A4.Placed 6.0 g of potassium nitrate in test tube B5.Placed 4.5 g of potassium nitrate in test tube C6.Placed 3.0 g of potassium nitrate in test tube D7.Placed 1.5 f of potassium nitrate in test tube E8.Placed all five test tubes in a 600 ml beaker that was half filled with water.9.Heated the beaker over a Bunsen burner flame until all of the potassium nitrate dissolved.10.Turned off Bunsen burner (when all solids dissolved).11.Removed test tubes from beaker.12.Placed thermometer, in the solution, in each test tube.13.Waited for crystals to appear and recorded the temperature at which they did on a data table.14.repeated steps 12 and 13 for each test tubeObservations:Test TubeTemperature for Re-crystallization (°C)A71B63C56D45E26-when the potassium nitrate was added to the water, before boiling, it sunk to the bottom-the potassium nitrate dissolved in the water at a very high temperature-some white residue was splattered onto the side of the test tube-after dissolving, the KNO3 and water created a clear solution-A white solid was formed in each test tube as the temperatures decreased-The KNO3 in each test tube re-crystallized at a different time-The KNO3 in test tube A was the first to re-crystallize and then B, C, D and E was the last to re-crystallize.Calculations:1.Using the mass of potassium nitrate dissolved in 5 ml of water; calculate the solubility of potassium nitrate in grams per 100 g of water for each of the 5 test tubes.To calculate the solubility of KNO3 in 100 g of water we must divide the mass of the KNO3 in each test tube by the mass of the distilled water in each test tube and then multiply by 100 (for the 100 g of water).Test Tube A: (7.5g KNO3 / 5g-mL-1) x 100g H2O = 150g KNO3Test Tube B: (6g KNO3 / 5g-mL-1) x 100g H2O = 120g KNO3Test Tube C: (4.5g KNO3 / 5g-mL-1) x 100g H2O = 90g KNO3Test Tube D: (3g KNO3 / 5g-mL-1) x 100g H2O = 60 KNO3Test Tube E: (1.5g KNO3 / 5g-mL-1) x 100g H2O = 30g KNO32.Construct a graph of solubility (grams of potassium nitrate per 100 g of water) versus temperature (°C). Plot grams of KNO3 per 100 g of water on the vertical axis and temperature on the horizontal axis. Draw the best smooth curve you can through the five data points.(Graph is contained on the attached graph paper)Questions:1.Why is the temperature of the water taken when crystals first begin to appear?The purpose of a solubility curve is to show how much solute will dissolve in a given volume at a given temperature for any given substance. The temperature at which the crystals first begin to appear is when the solution has become saturated and this is the maximum amount of solute that is able to dissolve in the solvent.2.What...

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