Teacher manual for AP* and Advanced Chemistry labs. Has both the printed version and a flash drive with teacher tips, a PDF of teacher version and editable Word student version.
Most ionic compounds are considered to be soluble or slightly soluble in water. Even compounds considered insoluble will dissolve to some small extent. This small extent can become very important when the dissolved substance is poisonous like lead, thallium, or cadmium. Over time, tiny amounts of these heavy metals can build up in your body and cause severe health problems. By knowing the amount of a dissolved ion in a solution, we can determine any potential health risks.
How can you determine the amount of dissolved ions in a solution?
Students determine the saturation concentration of a compound and the mass of dissolved solute.
The student is able to explain observations regarding the solubility of ionic solids and molecules in water and other solvents on the basis of particle views that include intermolecular attractions and entropic effects. The student can create visual representations of ionic substances that connect the microscopic structure to macroscopic properties, and/or use representations to connect the microscopic structure to macroscopic properties (e.g., boiling point, solubility, hardness, brittleness, low volatility, lack of malleability, ductility, or conductivity). The student can predict the solubility of a salt, or rank the solubility of salts, given the relevant Ksp values.
This experiment may require software and an interface for data collection.