Question

Karen will be assisting with her first equine surgery. Winnie is a 7-year-old Clydesdale weighing 670 kg. Winnie developed a suspicious mass on her left eye. Surgical removal of the mass for histopathology testing is the best course of action to determine further treatment. But there is a lot of preparation involved before they can begin! Karen will be preparing the surgical disinfectants and drugs in addition to assisting with the procedure itself. You must show all your work and include appropriate units in your answers to earn full credit. Round your answers to the nearest hundredths if necessary. Karen needs to prepare povidone-iodine solution in the correct concentration to prepare the surgical site. The solution comes in a 12.5% concentration. Karen needs to dilute the solution to a concentration of 2%. She needs 150 ml of solution to prepare the site.

a. Identify the standard formula for preparing solutions. (1 point)
b. How many milliliters of the 12.5% povidone-iodine should Karen start with? (2 points)
c. How many milliliters of water does Karen need? (2 points)

Answer 1

Karen should use 24 ml of the 12.5% povidone-iodine solution and add 126 ml of water to prepare 150 ml of a 2% solution for surgical disinfection.

Step-by-step explanation:

The task involves preparing a diluted povidone-iodine solution with a specific concentration for surgical disinfection. To do this, we need to apply a standard dilution formula, which is (Concentration1) x (Volume1) = (Concentration2) x (Volume2), often abbreviated to C1V1 = C2V2, where:

• C1 is the initial concentration of the solution (12.5%)
• V1 is the volume of the initial solution we need to find
• C2 is the final concentration of the solution (2%)
• V2 is the final volume of the diluted solution (150 ml)

Using this formula, we can solve for V1:

(12.5%) x V1 = (2%)(150 ml)

V1 = (2%)(150 ml) / (12.5%)

V1 = 24 ml

Karen should start with 24 ml of the 12.5% povidone-iodine. To find out how much water she needs, we subtract the volume of povidone-iodine from the total required volume of the solution.

150 ml - 24 ml = 126 ml

Karen will need 126 ml of water to prepare the 150 ml of 2% povidone-iodine solution.