Question

В химической лаборатории используют 35 процентный раствор пероксида водорода. Какую массу 3% аптечного раствора можно приготовить из 1,5 кг. раствора пероксида водорода, используемого в лаборатории? ​

Answer 1

m(р-ра)=$\frac{100*1.5}{35}$=4.29

Answer 2

Calculating the Mass of 3% Pharmacy Solution from 35% Hydrogen Peroxide Solution

To calculate the mass of a 3% pharmacy solution that can be prepared from 1.5 kg of a 35% hydrogen peroxide solution, we can use the concept of the conservation of mass.

The formula for this calculation is: C1V1 = C2V2

Where: - C1 = concentration of the initial solution - V1 = volume of the initial solution - C2 = concentration of the final solution - V2 = volume of the final solution

First, we need to find the volume of the 35% hydrogen peroxide solution that contains 1.5 kg of the solution. Then, we can use this volume to calculate the mass of the 3% pharmacy solution.

Calculating the Volume of 35% Hydrogen Peroxide Solution

To find the volume of the 35% hydrogen peroxide solution that contains 1.5 kg of the solution, we can use the density of the solution. The density of 35% hydrogen peroxide solution is approximately 1.3 g/ml.

Using the formula: mass = volume × density

We can rearrange the formula to solve for volume: volume = mass / density

Given: - mass = 1.5 kg = 1500 g - density = 1.3 g/ml

Calculating the volume: volume = 1500 g / 1.3 g/ml ≈ 1153.85 ml

So, the volume of the 35% hydrogen peroxide solution that contains 1.5 kg of the solution is approximately 1153.85 ml.

Calculating the Mass of 3% Pharmacy Solution

Now that we have the volume of the 35% hydrogen peroxide solution, we can use it to calculate the mass of the 3% pharmacy solution.

Given: - C1 = 35% (or 0.35 as a decimal) - V1 = 1153.85 ml - C2 = 3% (or 0.03 as a decimal) - V2 = the volume of the 3% pharmacy solution (which we need to find)

Using the formula C1V1 = C2V2, we can solve for V2: V2 = (C1V1) / C2

Substituting the values: V2 = (0.35 * 1153.85) / 0.03 ≈ 13461.76 ml

Converting the volume to kilograms: 13461.76 ml = 13.46176 L 1 L = 1 kg So, the mass of the 3% pharmacy solution that can be prepared from 1.5 kg of the 35% hydrogen peroxide solution is approximately 13.46176 kg.