PTCB PTCE Practice Test Question 90 - Ratio Concentration Math Calculation (Pharmacy Tech Test Prep)
Summary
This video explains how to calculate the new concentration of a solution after diluting it with sterile water. It provides step-by-step instructions and summarizes the solution's final concentration.
Sections
Calculating the Amount of Drug in Solution
Understanding 1 to 100 solution concentration.
A 1 to 100 solution means that there is 1 gram of a drug per 100 milliliters of solution.
Determining drug amount in 200 milliliters.
Using the cross-multiplication method, we calculate that there are 2 grams of the drug in 200 milliliters of the 1 to 100 solution.
Calculating new total volume after dilution.
After adding 300 milliliters of sterile water to the 200 milliliters of solution, the new total volume is 500 milliliters.
Finding new concentration after dilution.
The final concentration is determined to be 2 grams per 500 milliliters, which simplifies to a new concentration of 1 to 250.
Conclusion
Final concentration confirmed.
The new concentration of the solution after adding sterile water is confirmed to be 1 to 250.
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