What mass of potassium iodine should be dissolved in 200 grams of water to make a 3.0 percent solution?
To find the mass of potassium iodine that should be dissolved in 200 grams of water to make a 3.0 percent solution, we need to understand that a 3.0 percent solution means that there are 3 parts of solute (potassium iodine) for every 100 parts of solution (water + potassium iodine).
Here are the steps to calculate the mass of potassium iodine needed:
Step 1: Determine the quantity of solution needed.
In this case, we have 200 grams of water. The total solution will be 100% water + 3.0% potassium iodine.
Step 2: Convert the desired percentage concentration in mass/mass percent.
The 3.0% solution means there will be 3 grams of potassium iodine for every 100 grams of the solution.
Step 3: Calculate the mass of potassium iodine.
The mass of potassium iodine can be calculated using the following formula:
Mass of potassium iodine = (Percentage concentration / 100) x Mass of solution
= (3.0 / 100) x 200 grams
= 6 grams
So, to make a 3.0 percent potassium iodine solution, you would need to dissolve 6 grams of potassium iodine in 200 grams of water.