Question

ПОМОГИТЕ ПОЖАЛУЙСТА! Вычислите массовую долю лимонной кислоты в растворе, полученном при сливании 400 г 20%-го раствора и 150 г 10%-го раствора кислоты. Нужно подробное решение и ответ!

Answer 1

Ответ:

17%

Объяснение:

Мы знаем m(р-ра)1 =400г и w(кислоты)1=20%,

m(р-ра)2 =150г и w(кислоты)2 =10%

1. Найдем m(кислоты)1 по формуле m(кислоты)1= m(р-ра)1 × w(кислоты)1

m(кислоты)1= 400 × 0.2 = 80 гр

2. Тоже самое делаем и со вторым раствором

m(кислоты)2 по формуле m(кислоты)2= m(р-ра)2 × w(кислоты)2

m(кислоты)2= 150× 0.1= 15 гр

3. Сложим m(кислоты) 1 и m(кислоты) 2

15+80=95 г

4. По формуле w=m(кислоты)3/m(р-ра)3, найдем массовую долю кислоты в новом растворе где m(р-ра)3= 150+400=550гр

w= 95/550=0.17 или 17%

Answer 2

Calculation of Mass Fraction of Citric Acid in the Solution

To calculate the mass fraction of citric acid in the solution, we need to determine the total mass of citric acid in the solution and divide it by the total mass of the solution.

Let's start by calculating the mass of citric acid in the 20% solution and the 10% solution.

Mass of citric acid in the 20% solution: - Given: Mass of the 20% solution = 400 g - The 20% solution means that there is 20 g of citric acid in every 100 g of the solution. - Therefore, the mass of citric acid in the 20% solution is (20/100) * 400 g = 80 g.

Mass of citric acid in the 10% solution: - Given: Mass of the 10% solution = 150 g - The 10% solution means that there is 10 g of citric acid in every 100 g of the solution. - Therefore, the mass of citric acid in the 10% solution is (10/100) * 150 g = 15 g.

Now, let's calculate the total mass of the solution by adding the masses of the 20% and 10% solutions.

Total mass of the solution: - Mass of the 20% solution = 400 g - Mass of the 10% solution = 150 g - Therefore, the total mass of the solution is 400 g + 150 g = 550 g.

Finally, we can calculate the mass fraction of citric acid in the solution by dividing the mass of citric acid by the total mass of the solution.

Mass fraction of citric acid in the solution: - Mass of citric acid = 80 g + 15 g = 95 g - Total mass of the solution = 550 g - Mass fraction of citric acid = (95 g / 550 g) * 100% ≈ 17.27%

Therefore, the mass fraction of citric acid in the solution obtained by combining 400 g of a 20% solution and 150 g of a 10% solution is approximately 17.27%.

Please note that the sources provided do not contain relevant information for this specific calculation.