22 g of potassium iodide is diluted in 1.5 L of sterile water for injection. What is the final percent strength (w/v)?
To find the final percent strength (w/v), we need to calculate the amount of potassium iodide (in grams) per 100 mL of the solution.
Step 1: Convert the given volume from liters to milliliters:
1.5 L = 1.5 × 1000 mL = 1500 mL
Step 2: Calculate the percentage using the following formula:
Percent strength (w/v) = (grams of solute / volume of solution in mL) × 100
Step 3: Calculate the grams of solute:
22 g of potassium iodide
Step 4: Calculate the volume of solution in mL:
1500 mL
Step 5: Substitute the values into the formula:
Percent strength (w/v) = (22 g / 1500 mL) × 100
Step 6: Perform the calculation:
Percent strength (w/v) = 1.47 %
Therefore, the final percent strength (w/v) of the solution is 1.47%.