Question

К 40 г раствора хлорида бария добавляли сульфат натрия до прекращения выпадения осадка. масса осадка составила 4,66 г. Рассчитайте массовую долю хлорида бария в исходном растворе. P.S. У меня получилось 10,4%.

Answer 1

Да,у меня тоже получилось 10,4%

Answer 2

Calculation of the Mass Fraction of Barium Chloride in the Initial Solution

To calculate the mass fraction of barium chloride in the initial solution, we need to use the information provided.

According to the problem statement, a 40 g solution of barium chloride was used. Sodium sulfate was added to the solution until precipitation ceased, and the mass of the precipitate obtained was 4.66 g.

To find the mass fraction of barium chloride, we can use the following formula:

Mass Fraction = (Mass of Barium Chloride / Mass of Solution) x 100%

Let's calculate the mass fraction of barium chloride in the initial solution:

Step 1: Calculate the mass of barium chloride in the precipitate. The mass of the precipitate obtained is given as 4.66 g.

Step 2: Calculate the mass of the remaining solution. The mass of the remaining solution can be calculated by subtracting the mass of the precipitate from the initial mass of the solution. Initial mass of the solution = 40 g Mass of the precipitate = 4.66 g Mass of the remaining solution = 40 g - 4.66 g = 35.34 g

Step 3: Calculate the mass fraction of barium chloride. Mass of barium chloride = Mass of precipitate = 4.66 g Mass of solution = Mass of remaining solution = 35.34 g

Mass Fraction = (4.66 g / 35.34 g) x 100%

Now, let's calculate the mass fraction:

Mass Fraction = (4.66 g / 35.34 g) x 100% = 13.18%

Therefore, the mass fraction of barium chloride in the initial solution is approximately 13.18%.

Please note that the value you obtained (10.4%) differs from the calculated value (13.18%). It is important to double-check the calculations to ensure accuracy.