Question

При охлаждении 200 г 25% раствора соли выделилось 32,9 г этой соли. массовая доля соли в оставшемся растворе равна?

Answer 1

Дано:
m(р-р) = 200г
W = 0,25
m2 = 32, 9 г

Найти:
m2(в-ва) = ?


Решение:
W= m(в-ва) / m (р-р)
Было: m(соли) =200г × 0,25=50 г

Стало: m(cоли) = 50 _ 32, 9 =17,1
m (р-р) = 200 - 32, 9 = 167, 1
W=17,1/ 167, 1 =0,1 =10%

Answer 2

Calculation of the Mass Fraction of Salt in the Remaining Solution

To calculate the mass fraction of salt in the remaining solution, we need to determine the initial mass of salt and the mass of salt that was separated out.

Given: - Initial mass of the solution = 200 g - Concentration of the solution = 25% (w/w) - Mass of salt separated out = 32.9 g

To find the mass fraction of salt in the remaining solution, we can use the following formula:

Mass Fraction of Salt = (Mass of Salt in Remaining Solution) / (Mass of Remaining Solution)

To calculate the mass of the remaining solution, we subtract the mass of the separated salt from the initial mass of the solution:

Mass of Remaining Solution = Initial Mass of Solution - Mass of Separated Salt

Let's calculate the mass of the remaining solution:

Mass of Remaining Solution = 200 g - 32.9 g = 167.1 g

Now we can calculate the mass fraction of salt in the remaining solution:

Mass Fraction of Salt = 32.9 g / 167.1 g = 0.197 or 19.7%

Therefore, the mass fraction of salt in the remaining solution is approximately 19.7%.

Please note that the calculations are based on the given information and assumptions.