Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Published byEstella Phillips Modified over 9 years ago

Similar presentations

Presentation on theme: "Molar Concentration The most useful unit of concentration in chemistry is molar concentration. Molar concentration is the number of moles of solute in."— Presentation transcript:

1 Molar Concentration The most useful unit of concentration in chemistry is molar concentration. Molar concentration is the number of moles of solute in 1 L of solution. Notice that L is used rather than mL. Molar concentration is also known as molarity.

2 Molarity (mol/L) = amount of solute (mol) volume of solution (L) The formula can be shortened to: C = n/V

3 Molar concentration is particularly useful to chemists because it is related to the number of particles in a solution. If you are given the molar concentration and the volume of solution, you can calculate the amount of dissolved solute in moles. This allows you to solve problems involving quantities in chemical reactions.

4 Calculating Molar Concentration A saline solution contains 0.90 g of sodium chloride (NaCl), dissolved in 100 mL of solution. What is the molar concentration? Find the molar mass of NaCl Using molar mass and given amount, determine moles Convert the volume to L Use the molar concentration formula

5 Molar Mass of NaCl 22.989768 + 35.4527 = 58.4425 g/mol Determine moles 0.90 g x 1 mol=0.015 mol 58.4425 g Convert Volume 100 mL x L = 0.100 L 1000 mL Molar concentration 0.015 mol/0.100 L = 0.15 mol/L

6 Using Molar Concentration to Find Mass At 20 o C, a saturated solution of calcium sulfate (CaSO 4 ) has a concentration of 0.0153 mol/L. A student takes 65 mL of this solution and evaporates it. What mass (in g) is left in the evaporating dish?

7 Convert volume from mL to L. Rearrange formula to solve for amount of solute Determine molar mass of calcium sulfate Use the molar mass to find mass of CaSO 4

8 Convert volume from mL to L 65 mL x 1 L = 0.065 L 1000 mL Rearrange formula to solve for amount of solute Molar concentration = moles of solute volume of solution mol of solute = (molar concentration)(volume of soln) mol of solute = (0.0153 mol/L)(0.065 L) = 0.00099 mol

9 Determine molar mass of calcium sulfate 40.078 + 32.066 + 4(15.9994) = 136.142 g/mol Use the molar mass to find mass of CaSO 4 0.00099 mol x 136.142 g= 0.13 g 1 mol

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

Similar presentations

Highland Science Department Limiting Reactants in Solution.

Highland Science Department Limiting Reactants in Solution.
Concentration.  Distinguish between dilute and concentrated.  Calculate molarity.  Describe how to prepare solutions of given concentrations.  Calculate.

Concentration.  Distinguish between dilute and concentrated.  Calculate molarity.  Describe how to prepare solutions of given concentrations.  Calculate.
Concentration. Concentration Particles per volume Can be in grams per litre but chemists usually express concentration in moles per litre This are related.

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

Molarity and Dilutions
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.

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.
1 Solutions Chemistry I2 – Chapters 7 & 8 2 Some Definitions A solution is a homogeneous mixture of 2 or more substances. One constituent is usually.

1 Solutions Chemistry I2 – Chapters 7 & 8 2 Some Definitions A solution is a homogeneous mixture of 2 or more substances. One constituent is usually.
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.

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.
1 Concentration of Solute The amount of solute in a solution is given by its concentration The amount of solute in a solution is given by its concentration.

1 Concentration of Solute The amount of solute in a solution is given by its concentration The amount of solute in a solution is given by its concentration.
Solution Concentration Section 14.2 Concentration - amount of solute dissolved in a specific amount of solvent concentrated - a lot of solute dilute.

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?

1 SOLUTIONS A N I NTRODUCTION. 2 Objectives 1. What are different ways of expressing the concentration of a solution? When is each used?
Concentration Concentration is the amount of solute dissolved in an amount of solution. Molar concentration is called Molarity, or M. M = moles.

Concentration Concentration is the amount of solute dissolved in an amount of solution. Molar concentration is called Molarity, or M. M = moles.
Molarity = Molarity ( M ) moles solute liters of solution

Molarity = Molarity ( M ) moles solute liters of solution
Recap – Stoichiometry Balanced chemical equation Convert mass to moles

Recap – Stoichiometry Balanced chemical equation Convert mass to moles
a measure of the amount of solute that is dissolved in a given quantity of solvent unit of measurement is Molarity (M) which is moles/liter can be dilute.

a measure of the amount of solute that is dissolved in a given quantity of solvent unit of measurement is Molarity (M) which is moles/liter can be dilute.
Concentration Units: Terms like “dilute” and “concentrated” are not specific. Percent by Mass: Mass % = mass of solute x 100 Total mass of solution Recall:

Concentration Units: Terms like “dilute” and “concentrated” are not specific. Percent by Mass: Mass % = mass of solute x 100 Total mass of solution Recall:
III. Molarity Topic 9 The Mole. A. Molarity Concentration of a solution. total combined volume substance being dissolved.

III. Molarity Topic 9 The Mole. A. Molarity Concentration of a solution. total combined volume substance being dissolved.
Moles in Solution A solution consists of a solvent with a solute dissolved in it The concentration of a solutions tells us how much solute is present in.

Moles in Solution A solution consists of a solvent with a solute dissolved in it The concentration of a solutions tells us how much solute is present in.
Concentration. Determining the Concentration Concentration = Quantity of solute Quantity of Solution (Solute+Solvent )

Concentration. Determining the Concentration Concentration = Quantity of solute Quantity of Solution (Solute+Solvent )
Percent by mass, mole fraction, molarity, and molality

Percent by mass, mole fraction, molarity, and molality
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  -

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  -

Similar presentations

Ads by Google