Question

СРОЧНООО!! 1. сколько граммов воды надо добавить к 60 г 15% -ного раствора соли чтобы получить 10% -ный раствор соли? 1.1. найдите массу соли в полученном растворе и дайте ответ в граммах​​

Answer 1

Calculation of the Amount of Water Needed

To calculate the amount of water needed to obtain a 10% salt solution from a 60g 15% salt solution, we can use the concept of mass conservation.

Let's assume that x grams of water need to be added to the 60g 15% salt solution. The resulting solution will have a total mass of 60g + x grams.

Since the desired concentration is 10%, the mass of salt in the resulting solution will be 10% of the total mass.

Using these assumptions, we can set up the following equation:

(15% of 60g) = (10% of (60g + x))

Simplifying the equation:

0.15 * 60g = 0.10 * (60g + x)

9g = 6g + 0.1x

3g = 0.1x

x = (3g) / 0.1

x = 30g

Therefore, 30 grams of water need to be added to the 60g 15% salt solution to obtain a 10% salt solution.

Calculation of the Mass of Salt in the Resulting Solution

To find the mass of salt in the resulting solution, we can subtract the mass of water added from the total mass of the resulting solution.

The total mass of the resulting solution is the sum of the mass of the initial solution (60g) and the mass of water added (30g).

Total mass of the resulting solution = 60g + 30g = 90g

Since the desired concentration is 10%, the mass of salt in the resulting solution will be 10% of the total mass.

Mass of salt in the resulting solution = 10% of 90g

Mass of salt in the resulting solution = 0.10 * 90g = 9g

Therefore, the mass of salt in the resulting solution is 9 grams.