A salt solution is evaporated to dryness. If 66.5 g of the solution leaves 1,492 mg of dry salt, what is the percent concentration (w/w) of the salt in the solution?
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To find the percent concentration (w/w) of the salt in the solution, we need to determine the amount of salt present in the solution and then calculate it as a percentage of the total weight of the solution.
1. First, let's calculate the amount of salt in the solution. We know that 66.5 g of the solution leaves 1,492 mg (which is equal to 1.492 g) of dry salt.
2. To find the amount of salt, we subtract the weight of the dry salt from the weight of the solution:
Amount of salt = Weight of solution - Weight of dry salt
Amount of salt = 66.5 g - 1.492 g
Amount of salt = 65.008 g
3. Now that we've determined the amount of salt, we can calculate the percent concentration (w/w) of the salt in the solution:
Percent concentration (w/w) = (Amount of salt / Weight of solution) * 100%
Percent concentration (w/w) = (65.008 g / 66.5 g) * 100%
Percent concentration (w/w) ≈ 97.66%
Therefore, the percent concentration (w/w) of the salt in the solution is approximately 97.66%.