Question

Calculate the number of units per milliliter if a $2 \mathrm{~mL}$ vial of heparin containing 20,000 units $/ \mathrm{mL}$ is injected into $500 \mathrm{~mL}$ of normal saline solution. 

   Calculate the number of units per milliliter if a $2 \mathrm{~mL}$ vial of heparin containing 20,000 units $/ \mathrm{mL}$ is injected into $500 \mathrm{~mL}$ of normal saline solution.
Essential Math and Calculations for Pharmacy Technicians
Essential Math and Calculations for Pharmacy Technicians
Indra K. Reddy,… 1st Edition
Chapter 15, Problem 33 ↓

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The vial contains 20,000 units/mL and has a volume of 2 mL. Total units in vial = 20,000 units/mL * 2 mL = 40,000 units  Show more…

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Calculate the number of units per milliliter if a $2 \mathrm{~mL}$ vial of heparin containing 20,000 units $/ \mathrm{mL}$ is injected into $500 \mathrm{~mL}$ of normal saline solution.
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Key Concepts

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Volume Calculation
Volume calculation in dilution contexts involves determining the final volume of the mixture by summing the volumes of all individual components. Accurate volume calculation is crucial, as it directly impacts the resulting concentration when a substance is diluted.
Dilution Principle
The dilution principle is the method of reducing the concentration of a solute in a solution by adding more solvent, without altering the total amount of the solute. In practice, this involves dividing the total amount of the solute by the new total volume of the solution after the additional solvent is added.
Concentration
Concentration refers to the amount of a substance (solute) present in a given volume of solution. It is usually expressed as units per mL or similar ratios. Understanding concentration is essential to determine how potent or diluted a solution is after mixing different solutions.
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A patient is to receive: Heparin 800.0 units per hour. 20,000.0 units of heparin have been added to 500.0 mL Normal Saline. The fluid is to run via an infusion pump. How many mL/hr should the pump be programmed for in order to deliver the required hourly dose?
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