The mass of an alkali solution (w = 5%), which can be prepared from 10 g of sodium hydroxide, is …

Given:
ω (NaOH) = 5%
m (NaOH) = 10 g

To find:
m solution (NaOH) -?

1) In the course of solving the problem, it is necessary to use the basic formula:
ω (substances) = m (substances) * 100% / m solution (substances);
2) Calculate the mass of the sodium hydroxide solution:
m solution (NaOH) = m (NaOH) * 100% / ω (NaOH) = 10 * 100% / 5% = 200 g.

Answer: The mass of the NaOH solution is 200 g