Question

Какую массу соли надо растворить в 200 г воды, чтобы получить 10%-ный раствор

Answer 1

W% = m(соли)*100%/m(раствора)
Пусть х - масса соли
10% = х*100%/(х+200)
90х = 2000
х = 22,23 г

Answer 2

Calculating the Mass of Salt to Make a 10% Solution

To calculate the mass of salt needed to make a 10% solution in 200g of water, we can use the formula:

% concentration = (mass of solute / total mass) * 100

We can rearrange this formula to solve for the mass of the solute:

mass of solute = (% concentration * total mass) / 100

Substituting the given values: - % concentration = 10% - total mass = 200g

We can calculate the mass of the solute (salt) using the given information.

Calculation

mass of solute = (10% * 200g) / 100

mass of solute = (0.10 * 200g)

mass of solute = 20g

So, to make a 10% solution in 200g of water, you would need to dissolve 20g of salt.