Chemistry > GIZMOS > SCIENCE 101 Assignment C-5 Solubility and Temperature Gizmo(50 marks) (All)

SCIENCE 101 Assignment C-5 Solubility and Temperature Gizmo(50 marks)

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Assignment C-5 Solubility and Temperature Gizmo(50 marks) Log into www.explorelearning.com and search for solubility gizmo. Complete the following questions as you conduct the gizmo. Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. What happens when you stir a spoonful of sugar into hot water? It dissolves. 2. When sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water, also called a solution. If you can’t see the sugar, how can you tell that it is there? By the taste, it may appear slightly cloudy. 3. Does sugar dissolve more easily in hot water or cold water? < > Hot water Gizmo Warm-up A solution generally consists of two parts, a solute that is dissolved and a solvent that the solute is dissolved into. For example, sugar is a solute that is dissolved into the solvent water. In the Solubility and Temperature Gizmo™, you will study how temperature affects how much solute will dissolve in a solution. To begin, check that Potassium nitrate is selected and the Temp. of the water is 20 °C. Click OK. 1. In this solution, what is the solute? Potassium nitrate What is the solvent? Water. Click Add 10 g to mix 10 g of potassium nitrate into the water. A. Did all of the potassium nitrate dissolve? Yes B. How can you tell? All of the substance disappeared as I stirred. Activity A: Solubility Get the Gizmo ready: • Click Reset. • Check that the Temp. is 20 °C and that Potassium nitrate is selected. Question: How do we find how much solute can be dissolved in a solvent? 1. Observe: Click OK. Click Add 20 g, and observe the potassium nitrate being mixed into the solution. On the right, select the BAR CHART tab and turn on Show numerical value. The bars show how much solute has been added and how much has piled up on the bottom. Did all of the solute dissolve? Yes 2. Calculate: The concentration of a solution is equal to the mass of solute divided by the volume of solvent. Units of concentration are grams per 100 milliliters (g/100 mL, or g/dL). What is the concentration of this solution? 20 g/100 mL 3. Experiment: Click Add 20 g again. A. Did all of the solute dissolve? Explain how you can tell. No, because there is still some at the bottom of the tank. Also, the solute bar went up. B. Based on the amount of solute added and the amount piled up on the bottom, how many grams of solute dissolved in the water? 30.65g C. The solubility of the solution is equal to the maximum concentration of the solute.

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