Question

Смешивают 200г 80%-го раствора соли и 700г 20%-го раствора той же соли.Сколько КОНЦЕНТРАЦИЯ соли в полученном растворе?

Answer 1

80% – это процентное содержание соли в 200г раствора (концентрация 0,8)

Сколько г соли в этом растворе?
0,8 ·200=160(г)

20% – это содержание соли в 700 г раствора (концентрация соли 0,2)

Сколько г соли во втором растворе?
0,2·700=140 (г)Сколько г соли в полученном растворе?
160+140=300 (г)

Ответ: 300 г.

Answer 2

Calculation of Concentration of Salt in the Mixture

To calculate the concentration of salt in the resulting solution, we need to determine the total amount of salt in the mixture and the total volume of the resulting solution.

Given: - 200g of an 80% salt solution - 700g of a 20% salt solution

To find the total amount of salt in the mixture, we can calculate the sum of the amounts of salt in each solution.

Amount of salt in the 80% solution: - 80% of 200g = 0.8 * 200g = 160g

Amount of salt in the 20% solution: - 20% of 700g = 0.2 * 700g = 140g

Total amount of salt in the mixture: - 160g + 140g = 300g

Next, we need to determine the total volume of the resulting solution. Since the density of the solutions is not provided, we cannot directly calculate the volume. However, we can assume that the volumes of the solutions are additive, meaning that the total volume of the resulting solution is equal to the sum of the volumes of the initial solutions.

Assuming the density of the solutions is the same, we can use the mass-to-volume ratio to estimate the volumes.

Let's assume the density of the solutions is 1g/mL (which may not be accurate but will allow us to estimate the volumes).

Volume of the 200g 80% solution: - 200g / 1g/mL = 200 mL

Volume of the 700g 20% solution: - 700g / 1g/mL = 700 mL

Total volume of the resulting solution: - 200 mL + 700 mL = 900 mL

Now we can calculate the concentration of salt in the resulting solution by dividing the total amount of salt by the total volume of the solution.

Concentration of salt in the resulting solution: - 300g / 900 mL = 0.333 g/mL

Therefore, the concentration of salt in the resulting solution is 0.333 g/mL.

Please note that the assumption made about the density of the solutions may not be accurate, and the actual concentration of salt in the resulting solution may differ.