Question

Сколько соли и воды надо взять для приготовления 20 грамм 4%-ого раствора

Answer 1

0/0

В 20 граммах раствора воды будет 80%, а соли — 20%. 
1% от 20 грамм = 0,2 г. 
Воды будет 80 х 0,2 = 16 г. Соли будет 20 х 0,2 = 4 г. 
Столько и нужно взять. 
Проверка: 16 + 4 = 20.

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Answer 2

Calculating the Amount of Salt and Water for a 20g 4% Solution

To calculate the amount of salt and water needed to prepare a 20g 4% solution, we can use the formula for calculating the mass of solute and solvent. The formula for the mass of solute is:

Mass of Solute = (Percentage / 100) * Total Mass

And the formula for the mass of solvent is:

Mass of Solvent = Total Mass - Mass of Solute

Using these formulas, we can calculate the amount of salt and water needed for the solution.

Calculation

Given: - Total mass of the solution (salt + water) = 20g - Percentage of the solution = 4%

Using the formula for the mass of solute: Mass of Solute = (4 / 100) * 20g = 0.8g

Using the formula for the mass of solvent: Mass of Solvent = 20g - 0.8g = 19.2g

Therefore, to prepare a 20g 4% solution, you would need 0.8g of salt and 19.2g of water.