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Understanding Molarity in Chemistry: Calculations and Concepts

Explore the concept of molarity in chemistry and learn how to calculate concentration based on moles of solute and solvent volume. Understand the role of solutions and concentration measurements. Practice calculations for molarity in different scenarios.

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Understanding Molarity in Chemistry: Calculations and Concepts

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  1. Investigation 3: Lesson 1: Molarity!

  2. Admit Slip • Drinking water in our homes contains dissolved chlorine, a highly toxic substance. Why can we drink the water? Unit IV • Investigation II-X

  3. Today’s Objectives • Students will be able to: • Define molarity as a concentration • Calculate molarity given moles of the solute and volume of the solvent. Unit IV • Investigation II-X

  4. Agenda • Admit Slip • Homework Check • Notes • Product: Notes, Exit Slip Unit IV • Investigation II-X

  5. Solutions and Molarity 4 / 30 / 14 • A solution is a homogeneous mixture of two or more substances that is uniform throughout. • The substance in the greater amount (often a liquid) is called the solvent. • The solute is usually a solid and dissolved in the solvent. • Concentration is the amount of solute for a specified amount of solvent. Unit IV • Investigation II-X

  6. A common measure of concentration is moles per liter, mol/L, which is referred to as molarity, M. • If a solution is highly concentrated, it has a lot of solute per solvent and a high molarity. • If a solution is not very concentrated (dilute), it has only a little solute per solvent and a low molarity. Unit IV • Investigation II-X

  7. To calculate molarity from moles and volume, you divide moles by volume in liters. • If you have 2 moles and 5 L of solution, you have • If you are given grams of solute, you need to divide by molar mass to calculate moles before calculating molarity. Unit IV • Investigation II-X

  8. If you are given volume in milliliters, mL, you move the decimal 3 times to get the volume in liters. 50 mL = 0.050 L • To calculate moles from molarity and volume, you multiply them. Since , M * L = moles Unit IV • Investigation II-X

  9. Exit Slip • What is the concentration of a solution with 10 mol of sugar and a volume of 4 L? Unit IV • Investigation II-X

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