a salt solution is evaporated to dryness. If 25.7 g of the solution leaves 1,949 mg of dry salt, what is the percent concentration (w/w) of the salt in the solution

[1.949g/(25.7)]*100 = ?

To find the percent concentration (w/w) of the salt in the solution, you need to determine the mass of salt compared to the total mass of the solution.

Step 1: Convert the mass of the dry salt to grams.
1,949 mg = 1.949 g

Step 2: Calculate the mass of the solution.
Mass of solution = Mass of solution - Mass of salt
Mass of solution = 25.7 g - 1.949 g
Mass of solution = 23.751 g

Step 3: Calculate the percent concentration (w/w) of the salt in the solution.
Percent concentration (w/w) = (Mass of salt / Mass of solution) x 100
Percent concentration (w/w) = (1.949 g / 23.751 g) x 100
Percent concentration (w/w) ≈ 8.2%

Therefore, the percent concentration (w/w) of the salt in the solution is approximately 8.2%.