Answer:
[tex][/tex] To prepare a 4% KI solution, we need to calculate the amount of KI (potassium iodide) in grams required to make 250 mL of the solution.
Step 1: Calculate the total mass of the solution
Given that the solution is 4% KI, this means that 4% of the total mass of the solution is KI. The remaining 96% is water.
Total mass of solution = volume of solution (in mL) x density of solution ([tex] \frac{g}{ml}[/tex])
Since the density of water is approximately 1 g/mL, we can assume the density of the solution to be close to 1 [tex] \frac{g}{ml}[/tex].
Total mass of solution = 250 mL x 1 [tex] \frac{g}{ml}[/tex] = 250 g
Step 2: Calculate the mass of KI in the solution
Since the solution is 4% KI, we can calculate the mass of KI needed in the solution.
Mass of KI = 4% of total mass of solution
Mass of KI = 0.04 x 250 g
Mass of KI = 10 g
Therefore, you would need 10 grams of KI to prepare 250 mL of a 4% KI solution.
