Concentration of a Solution The concentration of a

Percent Composition by Mass • Sometimes the amount of solute present in the solution

Percent Composition Sample Problems • What is the percent composition of a solution that

Parts per Million (ppm) and Parts per Billion (ppb) Parts per Million (ppm) ppm

What Do You Think? • A 900. 0 g sample of sea water is

Molarity (M) • Molarity (M) is the number of moles of solute per liter

Molarity Sample Problems • What is the molarity of a 0. 500 L sample

Molality (m) • Molality is the concentration of a solution expressed in moles of

Molality Sample Problem • A solution was prepared by dissolving 17. 1 g of

Wrapping It Up • Reflect on what you have learned concerning the today’s topic.

Slides: 10

Download presentation

Concentration of a Solution • The concentration of a solution is a measure of the amount of solute in a given amount of solvent or solution. • Chemists commonly use several different ways to quantitatively express the concentration of a solution. These include: q Percent Composition by mass q Parts per million / Part per billion q Molarity (M) q Molality (m)

Percent Composition by Mass • Sometimes the amount of solute present in the solution is expressed as a percent by mass. • % Composition = grams of solute ------------grams of solution x 100 Remember: solution is the solute and solvent together

Percent Composition Sample Problems • What is the percent composition of a solution that contains 115 g Na. Cl dissolved in 500 g of H 2 O? • How many grams of KMn. O 4 are needed to make 500 g of a 12. 0% KMn. O 4 solution?

Parts per Million (ppm) and Parts per Billion (ppb) Parts per Million (ppm) ppm = mass of solute in solution 106 total mass of solution Parts per Billion (ppb) mass of solute in solution 109 ppb = total mass of solution

What Do You Think? • A 900. 0 g sample of sea water is found to contain 6. 7 x 10 -3 g Zn. Express this concentration in ppm.

Molarity (M) • Molarity (M) is the number of moles of solute per liter of solution. moles of solute (mol) • Molarity (M) = ----------------liters of solution (L)

Molarity Sample Problems • What is the molarity of a 0. 500 L sample of solution that contains 60. 0 g of sodium hydroxide (Na. OH)? • How many grams of sodium chloride (Na. Cl) are required to prepare 250. 0 m. L of a 3. 00 M solution?

Molality (m) • Molality is the concentration of a solution expressed in moles of solute per kilogram of solvent. • Molality (m) = moles of solute (mol) -----------------kilogram of solvent (kg)

Molality Sample Problem • A solution was prepared by dissolving 17. 1 g of glucose, C 6 H 12 O 6, in 275 g of water. What is the molality (m) of this solution?

Wrapping It Up • Reflect on what you have learned concerning the today’s topic. • Respond to the following… – What is the most important thing you learned today? – What is one question you would still like answered? – What is a way what you have learned today connects with what you knew before?