Question

Какой объем воды необходимо взять, чтобы из 50 г хлорида натрия приготовить 0,9% физиологический раствор? ​

Answer 1

0,9= 50/(50+x)

x= 5,5 (мл)

Answer 2

Calculating the Volume of Water Needed to Prepare 0.9% Saline Solution

To calculate the volume of water needed to prepare a 0.9% saline solution from 50g of sodium chloride, we can use the formula for calculating the concentration of a solution:

Concentration = (mass of solute / total mass of solution) x 100

In this case, the concentration is given as 0.9%, and the mass of the solute (sodium chloride) is 50g. We need to find the total mass of the solution and then calculate the volume of water needed.

Using the given concentration and mass of the solute, we can rearrange the formula to solve for the total mass of the solution:

Total mass of solution = (mass of solute / concentration) x 100

Let's calculate the total mass of the solution first.

Total mass of solution = (50g / 0.9) x 100

Total mass of solution = 5555.56g

Now, to find the volume of water needed, we subtract the mass of the solute from the total mass of the solution:

Volume of water = Total mass of solution - Mass of solute

Volume of water = 5555.56g - 50g

Volume of water = 5505.56g

Therefore, to prepare a 0.9% saline solution from 50g of sodium chloride, approximately 5505.56g (or 5505.56mL, as 1g of water is approximately equal to 1mL) of water is needed.