Solutions. A. Dilute vs. Concentrated 1. Dilute – small amount of solute 2. Concentrated – large amount of solute *Very qualitative… B. Molarity (M) 1.

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Presentation transcript:

Solutions

A. Dilute vs. Concentrated 1. Dilute – small amount of solute 2. Concentrated – large amount of solute *Very qualitative… B. Molarity (M) 1. Def – number of moles of solute dissolved in one liter of solution (usually water) 2. Formula M = Moles of Solute Liters of solution

1. IV saline solutions are often administered to patients in the hospital. One saline solution contains 1.25 g of NaCl in 100. mL of solution. What is the molarity? 2. Another solution is 2.5 M of NaCl. If 150. mL of solution are administered, how many moles of NaCl are given? 3. How many mL of solution should be administered if a patient needs moles NaCl? Assume the concentration of the solution is 1.25 M.

A. Dilution 1. Def - reduces the number of moles of solute per unit, but the total number of moles of solute does not change. 2. Formula M 1 x V 1 = M 2 x V 2

1. How many milliters of aqueous 2.00 M MgSO 4 solution must be diluted with water to prepare mL of aqueous M MgSO 4 2. How could you prepare 200 mL of 0.20 M NaCl using only a solution of 1.0 M NaCl and water?