Question

Какую массу воды надо добавить к 10 г 80%-ной уксусной эссенции для получения 3%-го раствора?

Answer 1

Масс доля = масса эссенции / масса раствора
масса эссенции = 10 * 0.8 = 8 г
опять считаем по тому же уравнению:
0.03 = 8 /(x +10)
x= 257 г

Answer 2

Calculating the Mass of Water Needed to Dilute 80% Acetic Acid to a 3% Solution

To calculate the mass of water needed to dilute 10g of 80% acetic acid to obtain a 3% solution, we can use the formula for dilution:

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

In this case, we are given: - C1 = 80% - V1 = 10g - C2 = 3% - V2 = unknown (we are solving for this)

We can rearrange the formula to solve for V2:

V2 = (C1V1) / C2

Substitute the given values: V2 = (80% * 10g) / 3%

Calculating the value: V2 = (0.8 * 10g) / 0.03

V2 = 8g / 0.03

V2 = 266.67g

So, to obtain a 3% solution from 10g of 80% acetic acid, you would need to add approximately 266.67g of water.