SOLUTIONS CONCENTRATION Dissolve break down in a solvent

SOLUTIONS & CONCENTRATION

Dissolve: break down in a solvent into tiny pieces too small to see. Soluble: capable of being dissolved. Solution: a homogeneous mixture of 2 or more substances in a single phase.

HETEROGENEOUS VS HOMOGENEOUS • Homogeneous mixtures are uniform in composition. • Example: Salt water • Heterogeneous mixtures are not uniform throughout. • Example: sand in water (as sand sinks)

Solute: the substance being dissolved in a solution. Solvent: What the solute is dissolved in.

DO NOW Imagine that it is a hot, summer afternoon and you are dying for an ice-cold glass of Kool-Aid. Write a paragraph describing how you will make your sugary concoction using the following words: dissolve, solute, solvent, solution, soluble. Then continue onto Model One

QUESTION 1 • Refer to Model 1. • What is the solvent in this scenario? • • What is the solute in this scenario? • • What is a dissolved lemonade mix particle represented by?

PLICKER QUESTION 2 • Lemonade solution 1 has ______ volume of solution as 2. A. MORE THE SAME B. LESS C. • Lemonade solution 1 has ______ quantity of solute as solution 2. A. MORE THE SAME B. LESS C.

QUESTION 3 • Lemonade Solution 2 is considered to be concentrated, and lemonade Solution 1 is considered to be dilute. Examine the two pictures in Model 1. List two ways to differentiate a concentrated solution from a dilute solution.

PLICKER QUESTION 4 • A glass is filled with the concentrated lemonade solution from Model 1. Is the solution in the glass the same concentration as the solution in the pitcher? A. YES B. NO • After responding tell your neighbor why your answer is right. • Does the solution in the glass contain the same number of solute particles as the solution in the pitcher? A. YES B. NO • How can the first question be true if the second answer is no? Discuss with your neighbor

QUESTION 5 • Do the terms “concentrated” and “dilute” provide any specific information about the quantities of solute or solvent in a solution? Explain.

MOLARITY Molarity is one way to measure the concentration of a solution. Molarity is the ratio of moles of solute to liters of solution Molarity (M) = moles of solute volume of solution in liters A 1. 00 molar (1. 00 M) solution contains 1. 00 mol solute in every 1 liter of solution. Units of molarity are: mol/L = M

MODEL 2 Respond to questions for model two STOP at practice questions 1 M: . 06 mol Cu. Cl 2 in. 06 L 3 M: . 18 mol Cu. Cl 2 in. 06 L 1 M: . 06 mol glucose in. 06 L 3 M: . 18 mol glucose in. 06 L 3 M: . 06 mol glucose in. 02 L

PLICKER QUESTION 10 • Consider beakers 3 -5 Model 2. Which answer best represents the quantity that is the same in all the beakers with 3 M solutions? A. Number Moles B. Volume Moles to Volume • Justify your answer to your neighbor. C. Ratio

PRACTICE QUESTION 13 • Calculate the molarity of a solution containing 2. 5 moles of sugar (C 6 H 12 O 6) in a. 75 liters of solution.

PRACTICE QUESTION 14 • A 3. 2 M solution of HCl contains 64 grams of HCl. How many milliliters is the solution? Plicker Options: A. 20 ml B. 1822 ml C. 1755 ml D. 548 ml

OPENER 3/22 PAIR PRACTICE QUESTIONS IN YOUR PURPLE PACKET • Answer the remaining practice questions with your table mate.

3/6 OPENER • What is the Molarity of 20 grams of HF in. 2 L of solution?