1. Percentage, Ratio Strength
Samantha Hall

2. Percentage Strength Units
w/v% =
w/w% =
v/v% =

3. w/v
g/100ml
D10W =
12%(w/v) NaCl sol’n =

4. v/v
ml/100ml
20% HCl v/v =

5. w/w
g/100g
0.025% triamcinolone w/w =

6. How many grams of triamcinolone are in a 15g tube of 0.025 w/w%?

7. How many mg of dextrose are in 50ml of D5W w/v? Sp gr of D5W is 1.14.

8. How many ml of HCl are in 250ml of 20% v/v HCl sol’n
How many ml of HCl are in 250ml of 20% v/v HCl sol’n? Sp gr of the solution is

9. A 100ml solution of 4. 5% w/v NaCl has a specific gravity of 1. 024
A 100ml solution of 4.5% w/v NaCl has a specific gravity of How much water is in the solution?

10. Ratio Strength Express the following as a percent strength 1:200=
1:50=
1:500 =

11. Percent Strength Express the following as a ratio strength: 0.033% =
.075% =
.01% =

12. How many mg of drug are in 2.7 ml of a 1:500 sol’n?

13. How many mg of epinephrine are in an epipen 1:2000
How many mg of epinephrine are in an epipen 1:2000? A single epipen contains 0.3mL.

14. How many mL of water are in 200mL of 1:250 sol’n with a specific gravity of 1.23?

15. How many mL of water is in 500ml of a 1:10,000 solution that has a specific gravity of 1.01?

16. Parts per Million/Billion
Express as a ratio:
1 PPM =
1 PPB =
Express w/ units

17. If a 1L solution is 500 PPM, how many mg of drug is in the solution?

18. How many mL of water are in 750mL of a 2000 PPM solution
How many mL of water are in 750mL of a 2000 PPM solution? Sp gr of the solution is 1.07.

19. Questions?