Let's do another one:
Question from Heather in California:
A Pharmacy Tech has been given 300mL of a 15% hydrochloric acid solution. The pharmacist asks the technician to dilute the solution to 1000mL with sterile water and to label the final solution. What percent should appear on the label?
The easiest way to solve this is with the formula:
C1 x V1 = C2 x V2
C - Concentration
V - Volume
1) First, plug in your known factors:
(.15)(300mL) = ( X )(1000mL)
(Concentration 2 is unknown = "X")
↓ ↓ ↓
2) Do the multiplication:
(.15)(300) = ( X )(1000)
45 = 1000X
↓ ↓ ↓
3) Do the Division to isolate X:
↓ ↓ ↓
4) Now you have the concentration of the larger volume.
.045 = X
4.5% = X
This is the easiest way to solve this problem. Thanks for the question Heather.
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