Question

Через 600 мл раствора H3PO4 85% концентрации (плотностью 1,7 г / мл), пропустили 71 г Р2О5. Вычислить массовую долю H3PO4 в новом растворе.

Answer 1

Решение во вложении..................

Answer 2

Calculation of the Mass Fraction of H3PO4 in the New Solution

To calculate the mass fraction of H3PO4 in the new solution, we need to consider the initial solution and the amount of P2O5 added.

Given: - Initial solution: 600 ml of H3PO4 with 85% concentration and a density of 1.7 g/ml. - P2O5 added: 71 g.

To calculate the mass fraction of H3PO4 in the new solution, we can follow these steps:

Step 1: Calculate the mass of the initial H3PO4 solution. The mass of the initial H3PO4 solution can be calculated using the formula:

Mass = Volume x Density

The volume of the initial solution is given as 600 ml, and the density is given as 1.7 g/ml. Plugging in these values, we can calculate the mass of the initial solution:

Mass of initial solution = 600 ml x 1.7 g/ml

Mass of initial solution = 1020 g.

Step 2: Calculate the mass of H3PO4 in the initial solution. The mass of H3PO4 in the initial solution can be calculated using the formula:

Mass of H3PO4 = Mass of initial solution x Concentration of H3PO4

The concentration of H3PO4 in the initial solution is given as 85%. Plugging in the values, we can calculate the mass of H3PO4 in the initial solution:

Mass of H3PO4 = 1020 g x 0.85

Mass of H3PO4 = 867 g.

Step 3: Calculate the total mass of the new solution. The total mass of the new solution can be calculated by adding the mass of the initial solution and the mass of P2O5 added:

Total mass of new solution = Mass of initial solution + Mass of P2O5 added

Total mass of new solution = 1020 g + 71 g

Total mass of new solution = 1091 g.

Step 4: Calculate the mass fraction of H3PO4 in the new solution. The mass fraction of H3PO4 in the new solution can be calculated using the formula:

Mass fraction of H3PO4 = Mass of H3PO4 / Total mass of new solution

Plugging in the values, we can calculate the mass fraction of H3PO4 in the new solution:

Mass fraction of H3PO4 = 867 g / 1091 g

Mass fraction of H3PO4 ≈ 0.795 or 79.5%.

Therefore, the mass fraction of H3PO4 in the new solution is approximately 79.5%