Calculating the Amount of Potassium Iodine Salt

To determine the amount of potassium iodine salt needed to create a 15% (mass/mass) solution, we need to follow a few steps:

Step 1: Understand the Problem
We are given that we need to prepare a solution with a concentration of 15% (mass/mass) potassium iodine salt. This means that for every 100g of the solution, 15g should be potassium iodine salt.

Step 2: Determine the Mass of the Solution
We are given that the mass of the water is 100g. Therefore, the total mass of the solution is also 100g.

Step 3: Calculate the Mass of Potassium Iodine Salt
To find the mass of potassium iodine salt needed, we can use the formula:

Mass of Potassium Iodine Salt = (Concentration of Potassium Iodine Salt / 100) x Mass of Solution

Plugging in the given values, we get:

Mass of Potassium Iodine Salt = (15 / 100) x 100 = 15g

Therefore, 15g of potassium iodine salt should be added to 100g of water to create a 15% (mass/mass) solution.

Explanation
Potassium iodine salt is added to water to create a solution with a specific concentration. In this case, we want a 15% (mass/mass) solution, which means that for every 100g of solution, 15g should be potassium iodine salt.

To calculate the amount of potassium iodine salt needed, we use the formula:

Mass of Potassium Iodine Salt = (Concentration of Potassium Iodine Salt / 100) x Mass of Solution

The concentration of potassium iodine salt is given as 15%, and the mass of the solution (water) is 100g. Plugging in these values, we find that the mass of potassium iodine salt needed is 15g.

Therefore, 15g of potassium iodine salt should be added to 100g of water to create a 15% (mass/mass) solution.