Question

Определить массу соли в которую следует добавить к 300 г раствора с массовой долей 10% для получения 20% раствора

Answer 1

Решение в файле.
задача решается через конверт Пирсона.
2 вариант решения.
m (H2O) = m (раствора)·ω(H2O) = 300·(1-0.1) = 270 г
В 20 % растворе массовая доля воды соответсвенно 80 %, тогда масса нового раствора:
m2(раствора) = m(H2O)/ω(H2O) = 270/0.8 = 337.5 u
m (соли) = 337,5-300 = 37,5 г

Answer 2

Calculation of the Mass of Salt to be Added

To determine the mass of salt that needs to be added to a 300 g solution with a mass fraction of 10% to obtain a 20% solution, we can use the following formula:

Mass of Salt = (Desired Mass Fraction - Initial Mass Fraction) / (Final Mass Fraction - Initial Mass Fraction) * Mass of Solution.

In this case, the initial mass fraction is 10% (0.1) and the final mass fraction is 20% (0.2). The mass of the solution is 300 g.

Using the formula, we can calculate the mass of salt as follows:

Mass of Salt = (0.2 - 0.1) / (0.2 - 0.1) * 300 g = 300 g

Therefore, to obtain a 20% solution, you would need to add 300 grams of salt to the 300 g solution with a mass fraction of 10%.

Please note that the calculation assumes that the volume of the solution remains constant during the process.

I hope this helps! Let me know if you have any further questions.