Chapter 3. Ratios and Proportions (1 of 26) Sample Questions

1. If 50 mL of 1:20 w/v solution is diluted to 1 000 mL, what is the ratio strength (w/v)?
  1. A. 1:20
  2. B. 1:40
  3. C. 1:400
  4. D. 1:500
Ans: C
1:20 = (1/20) x 100 = 5%
C2 = (5% x 50)/1000 mL
= 0.25% or = 25/10,000