Converting units

Converting Units x1000 x1000 kg g mg ÷1000 ÷1000

Converting Units x1000 x1000 kL L mL ÷1000 ÷1000

Unit g/L % ppm mg/L Using g and ml Example 25g/L 25% 25ppm 25mg/L 25𝑔 𝐿 25𝑚𝑔 1000𝑚𝐿 25𝑔 1000𝑚𝐿 25𝑔 100𝑚𝐿 25𝑔 1000000𝑚𝐿 0.025𝑔 1000𝑚𝐿

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

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

Practice Convert the following into ppm: 33% 129g/L 30g/750ml 0.6mg/L

Practice Place the following concentrations in order from least to most concentrated: a. 0.4% b.10g/L c. 35ppm d. 150mg/L

Dilutions

Drink too sweet! What do you do?

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

What’s happening to: Solute? Solvent? Concentration? 1 g of solute in 1 L of water C= 1g/L 3 L of water What’s happening to: Solute? Solvent? Concentration? 1 g of solute in 4 L of water C= 0.25g/L

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

Formula C1V1 = C2V2 Remember: mass remains the same!

Practice Problem Kamille had 50ml of 20g/L solution of Kool-Aid. She found it to be too sweet so she added another 50ml of water. What was the final concentration (g/L)? V1 = 50ml C1 = 20g/L = 0.05L V2 = 50ml + 50ml = 100ml C2 = ? = 0.1L C1V1 = C2V2 (20g/L)(0.05L) = C2(0.1L) C2 = 1𝑔/𝐿 0.1 = 10g/L

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