Molarity SCH 3U.

Slides:

Advertisements

Similar presentations

Concentration. Concentration Particles per volume Can be in grams per litre but chemists usually express concentration in moles per litre This are related.

Advertisements

Molarity and Dilutions

Solution Concentration Concentration – how much solute dissolved in amount of solvent Concentration – how much solute dissolved in amount of solvent what.

Molarity. Molarity Molarity (M) or molar concentration is a measure of the concentration of a solute in a solution. Unit for molar concentration is mol/L.

Friday, Feb. 21 st : “A” Day Monday, Feb. 24 th : “B” Day Agenda  Collect chromatography labs  Begin Section 13.2: “Concentration and Molarity” 

Spring Semester, 2013 Mrs. L. Fox. Concentration The amount of a dissolved substance occupying a given volume of the solution.

Chapter 18 Solutions. Liquids Miscible means that two liquids can dissolve in each other –water and antifreeze, water and ethanol Partially miscible-

Chapter 12 Solutions and Their Behavior. Solutions The Solution Process Why do things dissolve? 1) The driving force towards a more random state (entropy)

M OLARITY Solutions. M OLARITY (M) Is the number of moles of solute dissolved per Liter of solution. Also know as molar concentration. Unit M is read.

Molality Section 15.2.

Solution Concentration Section 14.2 Concentration - amount of solute dissolved in a specific amount of solvent concentrated - a lot of solute dilute.

1 SOLUTIONS A N I NTRODUCTION. 2 Objectives 1. What are different ways of expressing the concentration of a solution? When is each used?

DETERMING CONCENTRATIONS OF SOLUTIONS. MOLAR Molar is mol solube/1 L solution Making molar solution 1)Add ½ of the total solvent 2)Add required amount.

Chapter 13 Solutions. Liquids Miscible means that two liquids can dissolve in each other –water and antifreeze, water and ethanol Partially miscible-

Mole. Objectives: Define mole. Convert mole to number of particles.

Molarity. Calculations Using The Molarity Equation 1 st.) Calculate the molarity if you are given the components of the solution. 2 nd.) Calculate the.

Concentration Units: Terms like “dilute” and “concentrated” are not specific. Percent by Mass: Mass % = mass of solute x 100 Total mass of solution Recall:

Unit 8: Solutions Molarity. Concentration Concentration is a value that represents the amount of solute dissolved in a solvent.  Concentrated solutions.

III. Molarity Topic 9 The Mole. A. Molarity Concentration of a solution. total combined volume substance being dissolved.

MOLARITY A measurement of the concentration of a solution. Molarity (M) is equal to the moles of solute (n) per liter of solution M =__n__ = mol volL.

% by Mass Another way to measure the concentration of a solution % by mass = mass solute x 100 mass solution Solution = solute + solvent.

CONCENTRATION OF SOLUTIONS. Solute + The amount of solution can be expressed by: - mass m (g, kg) or - volume V (cm 3, mL, dm 3, L, m 3 ) m = V x  -

Molarity  Unit of Concentration  There are many units of concentration  Molarity is most useful to the chemist M = moles of solute Liters of solution.

Solutions A solution is formed when a substance is dissolved in a liquid. The concentration of the solution may be expressed as – grams per Litre g L -1.

Solution Concentration

Molar Concentration The most useful unit of concentration in chemistry is molar concentration. Molar concentration is the number of moles of solute in.

Molar Concentrations. Molarity is the number of moles of solute that can dissolve in 1 L of solution. Molar concentration (mol/L) = Amount of solute (mol)

Molarity • Molarity is a measure of molar concentration

Solutions & Solubility Concentration. Concentrations of Solutions Concentration of a solution is a measure of the amount of solute that is dissolved in.

By: Sarin Apelian:).  How do you calculate the molarity of a solution?  What effect does dilution have on the total moles of solute in solution?  What.

Solutions and Concentrations Notes Page 5. SOLUTIONS A homogenous mixture of two or more substances.

Solution: A mixture in which individual molecules or ions are dispersed in a liquid. Solvent: The liquid that makes up the majority of the solution. e.g.,

Chemists describe solutions in terms of concentration. We define the concentration of a solution as the amount of solute in a given volume of solution.

Molar Concentration. Molarity is the number of moles of solute that can dissolve in 1 L of solution. Molar concentration (mol/L) = Amount of solute (mol)

02 – CONCENTRATION - MOLARITY CHEMISTRY 30 – UNIT 2 – SOLUBILITY – CH. 16 IN TEXT.

Concentration Calculations Molarity. Objectives To calculate the molecular weight and moles of a substance To calculate the Molarity of a substance using.

Moles and Molarity Part 2. Molarity Often, chemists use deal with chemicals in solution form. A SOLUTION is a type of MIXTURE in which one substance is.

CONCENTRATION AND DILUTIONS. Concentrations of Solutions ■a dilute solution contains only a small amount of solute ■concentrated solution contains a large.

Chapter Four Reactions in Aqueous Solutions. Chapter Four / Reactions in Aqueous Solutions Solutions and concentrations Solution is a homogenous mixture.

Solution Concentration For Today: Concentrations of Solutions Descriptive and Calculated Tonight: Homework sheet Next Time: Problem Solving.

Two methods for Preparation of a desired volume of a Molar Solution  1) Preparation from a solid solute.  2) Preparation by Dilution of a Concentrated.

HW 7-3 P. 480, #124: When 50. mL of 5.4 M NaCl is diluted to a final volume of 300. mL, what is the concentration of the diluted solution? Mc =

Molality Section 15.2.

Molarity Chapter 15.2.

Making a solution.

Solutions & Chemical Equilibrium

Unit 13: Solutions & Equilibrium

Concentration of Solute

Solutions and Molarity

Molar Concentrations.

Warm up - Solutions.

BELLWORK 4/5/2018.

Unit 13: Solutions & Equilibrium

CONCENTRATION OF SOLUTIONS

Section 2: Concentration

Unit 3 Solutions Mr. Tsigaridis.

Molarity & Dilution.

Ch. 3 & 7 – The Mole II. Molarity (p ) C. Johannesson.

12-3: Concentration of Solutions

Ch. 3 & 7 – The Mole II. Concentration (p )

Molar Concentrations.

Molarity Essential Question: How do chemists determine the strength of solutions?

Which one of these is more concentrated?

Unit 3, Lesson 10: Molarity.

BELLWORK 4/6/2017.

Molarity Calculate the concentration of a solute in terms of grams per liter, molarity, and percent composition.

Presentation transcript:

Molarity SCH 3U

Learning Goals By the end of this lesson students will be able to: Use appropriate terminology related to aqueous solutions and solubility Solve problems related to the concentration of solutions by performing calculations involving moles

Concentrations of Solutions A solution with very little dissolved solute is said to be…. Dilute! A solution with a large amount of dissolved solute is said to be… Concentrated! These are qualitative descriptions only, NOT numerical values.

Molar Concentration = Molarity Molarity- is the concentration of a solution expressed as the number of moles of solute per liter of solution Molar Concentration = amount of solute (in mol) volume solution in L C = n V

Example 1 Suppose we had 3.10 mole of sucrose and proceeded to mix it into exactly 1.25 liter of solution. What would be the molarity of this solution? C = n V = 3.10 mol 1.25 L = 2.48 mol/L = 2.48 M Notice that both the units of mol and L remain, Neither cancels. A shorthand for mol/L used is a capital M.

Example 2 What is the molarity when 0.75 mol is dissolved in 2500 mL of solution? C = n V = 0.75 mol 2.50 L = 0.30 M Notice that no mention of a specific substance… It doesn't matter what substance Because one mole of anything contains 6.022 x 1023 The molarity would be the same.

Example 3 Suppose you had 58.44 grams of NaCl and you dissolved it in exactly 2.00 L of solution. What would be the molarity of the solution? Two steps: Step One: convert grams to moles. Step Two: divide moles by liters to get molarity. Now, let's change from using moles to grams. This is much more common. After all, chemists use balances to weigh things and balances give grams, NOT moles.

Example 3 Suppose you had 58.44 grams of NaCl and you dissolved it in exactly 2.00 L of solution. Step One: convert grams to moles using: n = m/M Given: m= 58.44g Calculate: MNaCl= n = MNaCl= MNa + MCl = 22.99 g/mol + 35.45 g/mol =58.44 g/mol n = m/M = 58.44 g /58.44 g/mol = 1.00 mol

Example 3 Suppose you had 58.44 grams of NaCl and you dissolved it in exactly 2.00 L of solution. What would be the molarity of the solution? Step Two: divide moles by liters to get molarity C = n V = 1.00 mol 2.00 L = 0.50M Sometimes, a book will write out the word "molar," as in 0.50-molar.

Examples 5 & 6 Do examples #4 and #5: 4) Calculate the molarity of 25.0 grams of KBr dissolved in 750.0 mL. 5) 80.0 grams of glucose (C6H12O6) is dissolved in enough water to make 1.00 L of solution. What is its molarity?

Solutions Here are the solutions: 4) Calculate the molarity of 25.0 grams of KBr dissolved in 750.0 mL. Solutions Step 1: Step 2:

Solutions Here are the solutions: 5) 80.0 grams of glucose (C6H12O6, mol. wt = 180. g/mol) is dissolved in enough water to make 1.00 L of solution. What is its molarity? Solutions Step 1: Step 2:

Homework Practice Problems Homework on Website