1. 1. A liquid cold medicine label says that there it is 12.5% alcohol per dose. A dose is 10 mL. How much of the 10 mL of medicine is alcohol?

2. 2. Three liters of antifreeze are added to four liters of water. What is the percentage of this antifreeze and water solution?

3. 3. How much sugar (in gram) is in 500 mL of a 15% sugar solution?

4. 4. One million gallons of water is found to contain 1 quart of a liquid contaminant. What is the concentration of this contaminant in ppm?

5. 5. Convert 0.04 ppm to ppb.

6. 6. A saline solution used in the hospital is 0.15 moles/liter. If the pharmacist needs to make up 20 L of saline bags for a day. How many moles of saline is this?

7. 7. Saline is sodium chloride. Find the gfm of sodium chloride and then find the mass from the previous problem to make the saline needed.

8. 8. A lab calls for a 0.5 M solution of sodium hydroxide (NaOH). If the teacher will need 300 mL of this solution, how many grams of NaOH will need to be measured out?

9. 9. Many of the solutions we use in class are 0.1 M. The science department goes through 4 L of 0.1 M HCl during the year. How many grams of HCl are needed?

10. 10. Fifty grams of CaCl 2 are given to a lab aide. The aide is told to use all of the CaCl 2 to make a 0.2 M solution. What volume will this solution have?

11. 11. One hundred milliliters of a 2 M salt solution needs to be diluted to a volume of 300 mL. What will be the concentration of the new dilute solution?

12. 12. 400 mL of a 3% solution has been left out in the sun and now the volume is only 325 mL. What is the concentration of the new solution?