Question

Помогите решить пожалуйста.В каких соотношениях необходимо смешать NaSO4 + H2O, чтобы поучить раствор с массовой долей соли 4%

Answer 1

4% - это 1/25, то есть нужно соль и воду смешать в массовом соотношении 1:25.

Answer 2

Mixing Na2SO4 and H2O to Obtain a Solution with a Mass Fraction of 4% Salt

To obtain a solution with a mass fraction of 4% salt, we can calculate the amount of Na2SO4 and H2O needed based on their respective mass fractions in the final solution.

Step 1: Calculate the Mass of Na2SO4 and H2O Needed

The mass fraction of Na2SO4 in the final solution is 4%, which means that for every 100 grams of the solution, 4 grams are Na2SO4. Therefore, the mass of Na2SO4 needed can be calculated using the following formula:

Mass of Na2SO4 = (Mass Fraction of Na2SO4 / 100) * Total Mass of Solution

Similarly, the mass of H2O needed can be calculated using the formula:

Mass of H2O = (100 - Mass Fraction of Na2SO4) / 100 * Total Mass of Solution

Step 2: Determine the Total Mass of the Solution

To calculate the total mass of the solution, we need to decide on a specific quantity. Let's assume we want to prepare 500 grams of the solution.

Step 3: Calculate the Mass of Na2SO4 and H2O

Using the formulas from Step 1, we can calculate the mass of Na2SO4 and H2O needed for a 500-gram solution with a 4% mass fraction of Na2SO4.

Mass of Na2SO4 = (4 / 100) * 500g = 20g Mass of H2O = (100 - 4) / 100 * 500g = 480g

Therefore, to obtain a solution with a mass fraction of 4% Na2SO4, you would need to mix 20 grams of Na2SO4 with 480 grams of water.

I hope this helps! If you have any further questions or need additional assistance, feel free to ask.