L4a Dissolving PDF
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This document provides notes on the topic of dissolving, covering learning objectives, diagrams, concepts, and questions related to volume, mass, and conservation of mass during solubility processes. It also discusses important concepts around dilute and concentrated solutions.
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Investigating dissolving Learning objectives To further practice using the terms solute, solvent and solution To observe what happens when something dissolves. To understand what happens when something dissolves To understand dissolving in terms of the effects of volume and mass of...
Investigating dissolving Learning objectives To further practice using the terms solute, solvent and solution To observe what happens when something dissolves. To understand what happens when something dissolves To understand dissolving in terms of the effects of volume and mass of the solvent The solvent is a liquid and there are small spaces between the particles. The solute particles can fit in these small spaces. The volume of the solvent = the volume of the solution. The level of liquid in a beaker before adding solute is the same as after adding a soluble solute It might look like the solute has disappeared in the solution, and so the mass of the solute might not be present but the solute particles are just too small to see. What will the mass of this solution be? Mass of solute = 0.2g Mass of solvent = 1.7g Dissolving notes Volume When a solution/solute is added to a solvent the total volume/mass of the solvent does / does not change The solvent is a liquid and there are small / large spaces between the solvent particles. The solute particles can / cannot fit in the spaces between the solvent particles. Eg 5ml of water + 1g of salt à ____ml of saltwater solution Mass The mass of a solution is less than / equal to / greater than the mass of the solute and the mass of the solvent. Eg 5g of water + 1g salt = ____g of saltwater solution This is called ‘conservation of mass’ Extension- thinking / discussing questions (no writing): What do the words dilute and concentrated mean? If 5g of water can dissolve 1g of salt does this mean 5g of water can dissolve 1g of any solid? If 1g of salt dissolves in 5g of water does this mean 1g of salt will dissolve in any liquid? What happens when all the spaces between solvent particles are occupied? How might temperature effect solubility?
