S-C-9-3_Concentrations Presentation

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Presentation transcript:

S-C-9-3_Concentrations Presentation Solution Concentration the quantity of solute dissolved in a specific quantity of solvent or solution S-C-9-3_Concentrations Presentation

3 Ways of Expressing Solution concentration 1. Molarity (M): 2. Molality (m): 3. Percent by Mass : Parts per hundred (pph) or percent by mass Parts per thousand (ppt) Parts per million (ppm)

Molarity Molarity (M) is equal to the moles of a solute x per liter of solution M = mol / L First, calculate the moles of solute. Next, convert mL to L. Last, plug the appropriate values into the correct variables in the equation.

Molarity Practice: Calculate the molarity of a solution prepared by mixing 1.5 g of NaCl in 500.0 mL of water. 1. First calculate the moles of solute 2. Next convert mL to L 3. Last, plug the appropriate values into the correct variables in the equation

Molality Molality(m): or “molal concentration” is the moles of solute per kilogram of solvent. First, calculate the moles of solute. Next, convert g to kg. Last, plug the appropriate values into the correct variables in the equation.

Molality Practice: What is the molality of a solution in which 3.57 g of sodium chloride (NaCl) is dissolved in 25.0 g of water? 1. First calculate the moles of solute 2. Next convert g to kg 3. Last, plug the appropriate values into the correct variables in the equation

Percent by Mass: Describes the amount of solute dissolved in 100, parts of solution (g solute per H20) Need: The mass of the solute in the solution. The mass of the solution.

Percent by Mass Practice: (pph) In medicine a common intravenous (IV) saline solution contains 4g NaCl dissolved in 496g of distilled water. What is the concentration of this solution, expressed as grams of NaCl per 100g of solution?

Parts per Thousand (ppt) 1 teaspoon of sucrose, which has a mass of 10 grams is dissolved in 240 grams of water, what is it concentration in ppt?

Parts per Million (ppm) If 10g of mercury was dissolved in 600,000L of lake water, what is its concentration in ppm?