Question

Какова станет массовая доля безводного сульфата меди в растворе, если к 500г 10% раствора его добавить 25г медного купороса CuSO4∙ 5H2O

Answer 1

Нам нужно сначала посчитать М медного купороса, чтобы найти его n. М медного купороса составляет 252 г:моль, а значит, количество добавленного медного купороса равна 25 : 252 ≈ 0,1 моль. Молярная масса сульфата меди равна 160 г : моль. Тогда масса добавленного сульфата меди равна 0,1*160 = 16 г. Мы можем вычислить массовую долю сульфата меди. Она составит (16 + 50) : (500 + 25) = 66 : 525 ≈ 12,6. Ответ: 12,6

Answer 2

Calculating the Mass Fraction of Anhydrous Copper Sulfate in Solution

To calculate the mass fraction of anhydrous copper sulfate in the solution, we can use the given information about the initial mass of the solution and the amount of copper sulfate pentahydrate added.

Given: - Initial mass of the solution (mixture of water and copper sulfate): 500g - Concentration of the solution: 10% - Mass of copper sulfate pentahydrate added: 25g

Calculation Steps:

1. Calculate the initial mass of anhydrous copper sulfate in the solution. 2. Calculate the total mass of the solution after adding the copper sulfate pentahydrate. 3. Determine the mass fraction of anhydrous copper sulfate in the final solution.

Step 1: Calculate the Initial Mass of Anhydrous Copper Sulfate in the Solution

The initial mass of anhydrous copper sulfate in the solution can be calculated using the concentration of the solution.

Initial mass of anhydrous copper sulfate = Initial mass of the solution * Concentration of the solution

Initial mass of the solution = 500g Concentration of the solution = 10%

Initial mass of anhydrous copper sulfate = 500g * 10% = 50g

Step 2: Calculate the Total Mass of the Solution After Adding Copper Sulfate Pentahydrate

After adding 25g of copper sulfate pentahydrate, the total mass of the solution will be the sum of the initial mass and the mass of copper sulfate pentahydrate.

Total mass of the solution = Initial mass of the solution + Mass of copper sulfate pentahydrate

Total mass of the solution = 500g + 25g = 525g

Step 3: Determine the Mass Fraction of Anhydrous Copper Sulfate in the Final Solution

The mass fraction of anhydrous copper sulfate in the final solution can be calculated using the total mass of the solution and the initial mass of anhydrous copper sulfate.

Mass fraction of anhydrous copper sulfate = Initial mass of anhydrous copper sulfate / Total mass of the solution

Mass fraction of anhydrous copper sulfate = 50g / 525g ≈ 0.0952

Therefore, the mass fraction of anhydrous copper sulfate in the final solution is approximately 9.52%.