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## Describing Solution Composition

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**Describing Solution Composition**15.2: Pgs 528 - 534**Mass Percent**• Describes the amount of solution in terms of mass • Suppose a solution is made by dissolving 13.4g of NaCl in 56.6 mL of water. What is the mass percent of NaCl in this solution?**Solution Concentration**• Molarity: number of moles of solute per liters of solution • Molarity **Solution Concentration**• Molarity – What is the molarity of a 1 L solution containing 6 moles of sugar? What is the molarity if the 6 moles of sugar is dissolved in only 500 mL of solution?**Example:**• What is the molarity if 11.5 g of NaOH is added to 1.5 L of water?**Practice!!**• What is the molarity if 1.56 g of HCl is added to 26.8 mL of solution.**Practice 2!!**• How many grams of formaldehyde (HCHO) must be used to prepare 2.5 L of 12.3 M solution?**Solution Concentration**• Standard Solution – when the concentration is accurately known. • Made using a volumetric flask