Question

Для маринования мяса 200 г 7% раствора уксусной кислоты разбавили 50 г воды. Вычислите массовую долю кислоты в полученном растворе.

Answer 1

Дано:
m р-ра(CH3COOH)- 200г
m(H2O)- 50г
ω1- 7%
ω2- ?
1) найдём сколько кислоты в растворе:
200*0,07=14 г
2) Найдём m образов. раствора:
200+50= 250 г
3) ω(к-ты)= 14/250*100%=5,6%

Answer 2

Calculation of the Mass Fraction of Acetic Acid in the Solution

To calculate the mass fraction of acetic acid in the solution, we need to determine the mass of acetic acid and the total mass of the solution.

Given: - Mass of acetic acid = 200 g - Concentration of acetic acid = 7% - Volume of water added = 50 g

To find the mass of acetic acid in the solution, we can use the formula:

Mass of acetic acid = Concentration of acetic acid × Total mass of the solution

The total mass of the solution is the sum of the mass of acetic acid and the mass of water added.

Let's calculate the mass of acetic acid in the solution first:

Mass of acetic acid = 7% × Total mass of the solution

To find the total mass of the solution, we add the mass of acetic acid and the mass of water:

Total mass of the solution = Mass of acetic acid + Mass of water

Now, let's substitute the given values into the equations and calculate the mass fraction of acetic acid in the solution.

Mass of acetic acid = 7% × (Mass of acetic acid + Mass of water)

Total mass of the solution = Mass of acetic acid + Mass of water

Substituting the given values:

Mass of acetic acid = 0.07 × (200 g + 50 g)

Total mass of the solution = 200 g + 50 g

Calculating the values:

Mass of acetic acid = 0.07 × 250 g = 17.5 g

Total mass of the solution = 200 g + 50 g = 250 g

Now, we can calculate the mass fraction of acetic acid in the solution:

Mass fraction of acetic acid = (Mass of acetic acid / Total mass of the solution) × 100%

Substituting the calculated values:

Mass fraction of acetic acid = (17.5 g / 250 g) × 100%

Calculating the value:

Mass fraction of acetic acid = 7%

Therefore, the mass fraction of acetic acid in the obtained solution is 7%.