WARM UP ACT Prep Passage V 5 minutes Start when the bell rings.

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Presentation transcript:

WARM UP ACT Prep Passage V 5 minutes Start when the bell rings

Concentrations of Solutions

Concentration Definition Amount of solute in a quantity of solvent/solution

Basic Concentration Descriptions Saturated solution –Maximum amount of dissolved solute Unsaturated solution –Can dissolve more solute

Basic Concentration Descriptions Supersaturated solution –More solute than can normally be dissolved Increased temp. –Unstable Crystallization

Mathematical Concentration Units Percent by Mass o Mass of solute Mass of solution solution = solute + solvent o Unit: % x 100

Mathematical Concentration Units Mole Fraction o Moles of solute Moles of solution solution = solute + solvent o No unit

Mathematical Concentration Units Molarity o Moles of solute Liters of solution solution = solute + solvent o Unit: M

Mathematical Concentration Units Molality o Moles of solute Mass of solvent (kg) o Unit: m

Chemistry and Math All equations can be set up to find any unknown value May need to convert to get to the unit you need for a formula

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WRAP UP If you have a solution of 11.2 g of NaCl and g of H 2 O (d=1.0 g/mL), that create 120 mL of solution when mixed, calculate: –% by mass –mole fraction

WARM UP The molality of a solution of chlorine and water is.0362 m. This solution contains 3500 g of water. How much chlorine, in grams, was used to prepare this solution?

WRAP UP If you have a solution of 11.2 g of NaCl and g of H 2 O (d=1.0 g/mL), that create 120 mL of solution when mixed, calculate: –molality –molarity