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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