Unit 6: Solutions Molarity.

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Presentation transcript:

Unit 6: Solutions Molarity

Solutions – Key Terms Solute: the substance dissolved in a solution Solvent: the dissolving medium in a solution Solution: a homogenous mixture of solute + solvent Image from: http://www.ssc.education.ed.ac.uk/bsl/chemistry/soluted.html

Kool-Aid What are the solute(s) and solvent?

Chocolate Milk What are the solute and solvent?

Concentration Units Concentration: a measure of the amount of solute dissolved in a given quantity of solvent A dilute solution contains a small amount of solute A concentrated solution contains a large amount of solute Image from: http://pharmaxchange.info/press/2011/02/a-primer-on-measuring-concentrations-%E2%80%93-molarity-moles-and-other-confusing-stuff/3-2/

Molarity Molarity (M): the number of moles of solute dissolved in 1 L of solution Units: M ex: 4.0 M is “4 molar”

Molarity Example: 0.0117 mol of sugar is dissolved in a 0.350 L teacup filled with hot water. What is the molarity of the sugar solution? Known: moles = 0.0117 mol volume = 0.350 L Unknown: Molarity Equation: Answer: 0.0334 M

Molarity Example: Intraveneous (IV) saline solutions are often administered to patients in the hospital. One saline solution contains 0.90g NaCl in exactly 100. mL of solution. What is the molarity of the solution? Known: Mass = 0.90 g NaCl Volume = 100 mL solution Unknown: Molarity Equation: Answer: 0.15 M

Molarity Exit Slip What is the molarity of a solution in which 5.3 grams of CaCl2 is dissolved in water to make 2.1 L of solution? SHOW ALL OF YOUR WORK!