Question

what is the strength of a solution if 1 fl oz of hydrogen peroxide is mixed with 3 fl oz of normal saline?
¼ strength
1/3 strength
½ strength
2/3 strength
question 4 (2.5 points)
a patient is prescribed 1 l of ns. which solution should be given?
5% dextrose
0.9% normal saline
0.45% normal saline
0.225% normal saline

Explanation:

Question 3

Step1: Find total volume

The volume of hydrogen peroxide is \(1\) fl oz and normal saline is \(3\) fl oz. Total volume \(= 1 + 3 = 4\) fl oz.

Step2: Calculate strength

Strength is the ratio of hydrogen peroxide volume to total volume. So strength \(=\frac{1}{4}\)? Wait, no, wait. Wait, the hydrogen peroxide is the solute? Wait, no, wait, maybe I got it wrong. Wait, the solution strength here: when you mix 1 fl oz of hydrogen peroxide with 3 fl oz of saline, the total volume is \(1 + 3 = 4\) fl oz. The amount of hydrogen peroxide is 1 fl oz. But wait, maybe the strength is the fraction of the active ingredient (hydrogen peroxide) in the solution. So the strength is \(\frac{\text{volume of hydrogen peroxide}}{\text{total volume of solution}}=\frac{1}{1 + 3}=\frac{1}{4}\)? Wait, no, the options have ¼ strength? Wait, the options are ¼ strength, 1/3 strength, ½ strength, 2/3 strength. Wait, maybe I made a mistake. Wait, maybe the total volume is 3 fl oz? No, the problem says 1 fl oz of hydrogen peroxide mixed with 3 fl oz of normal saline. So total volume is \(1 + 3 = 4\) fl oz. The hydrogen peroxide is 1 fl oz, so the strength is \(\frac{1}{4}\)? Wait, but ¼ strength would mean that the solution is ¼ hydrogen peroxide. Wait, but let's check again. Wait, maybe the question is about the dilution. If you have 1 part of hydrogen peroxide and 3 parts of saline, the total parts are 4, so the hydrogen peroxide is 1/4 of the solution, so the strength is ¼. So the correct option is ¼ strength.

NS stands for normal saline, and the standard normal saline solution is 0.9% sodium chloride in water. So if a patient is prescribed 1 L of NS, the solution to be given is 0.9% normal saline.

Answer:

¼ strength (the option with ¼ strength)

Question 4