Converting units Converting Units x 1000 kg g

Converting units

Converting Units x 1000 kg g x 1000 mg

Converting Units x 1000 k. L L m. L

Unit g/L % ppm mg/L Example 25 g/L 25% 25 ppm 25 mg/L Using g and ml

Practice Convert the following into percent concentration: 150 g/L 25 ppm 37 g/400 ml 14 mg/L

Practice Convert the following into g/L: 12% 28 ppm 30 g/500 ml 24 mg/L

Practice Convert the following into ppm: 33% 129 g/L 30 g/750 ml 0. 6 mg/L

Practice Place the following concentrations in order from least to most concentrated: a. 0. 4% b. 10 g/L c. 35 ppm d. 150 mg/L

Dilutions

Drink too sweet! What do you do?

What is Dilution? Reducing the concentration of a solution by the addition of solvent

3 L of water 1 g of solute in 1 L of water C= 1 g/L 1 g of solute in 4 L of water C= 0. 25 g/L What’s happening to: -Solute? -Solvent? -Concentration?

Dilution When you are diluting a substance the amount of solute remains the same The volume of solvent increases Therefore the concentration decreases

Formula C 1 V 1 = C 2 V 2 Remember: mass remains the same!

Practice Problem Kamille had 50 ml of 20 g/L solution of Kool-Aid. She found it to be too sweet so she added another 50 ml of water. What was the final concentration (g/L)? V 1 = 50 ml = 0. 05 L C 1 = 20 g/L V 2 = 50 ml + 50 ml = 100 ml = 0. 1 L C 2 = ? C 1 V 1 = C 2 V 2 (20 g/L)(0. 05 L) = C 2(0. 1 L) = 10 g/L

Practice Workbook: p. 30 -33 P. 36 -39