Question

К 15% раствору hno3 массой 200 г прилили 300г 10% раствора этой же кислоты. Определите массовую долю этой кислоты в полученом расстворе

Answer 1

W(HNO3) =(200*0.15 + 300*0.1) / (200+300) *100% = 60/500*100% =12%

Answer 2

Task: Calculating the Mass Fraction of Nitric Acid in a Solution

To calculate the mass fraction of nitric acid in the resulting solution, we need to consider the initial 15% nitric acid solution and the 10% nitric acid solution that was added to it.

Let's break down the problem step by step:

1. Calculate the mass of nitric acid in the initial 15% solution: - The initial solution has a mass of 200 g and a concentration of 15%. - To find the mass of nitric acid, we multiply the mass of the solution by the concentration of nitric acid: 200 g * 0.15 = 30 g.

2. Calculate the mass of nitric acid in the 10% solution that was added: - The added solution has a mass of 300 g and a concentration of 10%. - To find the mass of nitric acid, we multiply the mass of the solution by the concentration of nitric acid: 300 g * 0.10 = 30 g.

3. Calculate the total mass of nitric acid in the resulting solution: - Add the masses of nitric acid from the initial solution and the added solution: 30 g + 30 g = 60 g.

4. Calculate the mass fraction of nitric acid in the resulting solution: - Divide the mass of nitric acid in the resulting solution by the total mass of the resulting solution and multiply by 100 to get the mass fraction as a percentage. - The total mass of the resulting solution is the sum of the masses of the initial solution and the added solution: 200 g + 300 g = 500 g. - The mass fraction of nitric acid is calculated as: (60 g / 500 g) * 100 = 12%.

Therefore, the mass fraction of nitric acid in the resulting solution is 12%.

Please let me know if you need any further assistance!