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Presentation transcript:

Bellwork

Concentrations of Solutions

Solute vs. Solvent Concentration- measure of the amount of solute that is dissolved Dilute- contains small amount of solute Concentrated- contains large amount of solute

Molarity (M) M = moles of solute/ liters of solution Liters is total volume, not just volume of solvent

Practice 5.2 moles of sugar are dissolved in 9.82 L of water. What is the molarity? 5.2/9.82= 0.53 M

Saline solutions are given to patients in a hospital Saline solutions are given to patients in a hospital. One saline solution contains 90.0 g NaCl in exactly 100. mL of solution. What is the molarity of the solution?

A solution of NaCl has a molarity of 2. 8 M A solution of NaCl has a molarity of 2.8 M. The solution has a volume of 250 mL. How many grams of NaCl are in this solution?

Molality (m)

[coca cola]

Another way to express concentration NOT THE SAME AS MOLARITY! m= moles solute/ kg solvent

Practice What is the molality of a solution that contains 3.5 moles of CaCl2 in 2.25 kg of water?

How many grams of KI must be dissolved in 500 How many grams of KI must be dissolved in 500.0 g of water to produce a 0.060 molal KI solution?