Final answer:
To calculate the mass of KI in a 25.0 mL 3.0% (m/v) solution, multiply the volume by the concentration in g/mL, which gives 0.75 grams of KI.
Step-by-step explanation:
The question is asking how many grams of KI are present in 25.0 mL of a 3.0 % (m/v) KI solution. To find the mass of KI in the solution, you can use the formula:
Mass of solute (g) = Volume of solution (mL) × Percentage concentration (m/v)
First, convert the percentage concentration to decimal form by dividing by 100:
3.0% (m/v) = 0.03 g/mL
Then, multiply the volume of the solution by this decimal concentration:
Mass of KI = 25.0 mL × 0.03 g/mL = 0.75 g
Therefore, there are 0.75 grams of KI in 25.0 mL of a 3.0% (m/v) KI solution.