Question

К 200 г 20% раствора соли добавили 10г воды. Какова новая массовая доля соли в полученном растворе?

Answer 1

W (соли) = 10/200*100=0,05*100=5 %

Овет: 5 % - массовая доля соли в растворе.

Answer 2

Calculation of the New Mass Fraction of Salt in the Solution

To calculate the new mass fraction of salt in the solution, we need to consider the initial mass of the salt solution and the mass of water added.

Given: - Initial mass of the salt solution: 200 g - Percentage concentration of the salt solution: 20% - Mass of water added: 10 g

To find the new mass fraction of salt in the solution, we can follow these steps:

Step 1: Calculate the mass of salt in the initial solution: - Mass of salt = Initial mass of the salt solution * (Percentage concentration of salt / 100) - Mass of salt = 200 g * (20 / 100) = 40 g

Step 2: Calculate the new total mass of the solution: - New total mass = Initial mass of the salt solution + Mass of water added - New total mass = 200 g + 10 g = 210 g

Step 3: Calculate the new mass fraction of salt in the solution: - New mass fraction of salt = Mass of salt / New total mass - New mass fraction of salt = 40 g / 210 g ≈ 0.1905

Therefore, the new mass fraction of salt in the obtained solution is approximately 0.1905 or 19.05%.

Please note that the search results did not provide a direct answer to the question. The calculation was performed based on the given information and standard principles of calculating mass fractions in solutions.