Question

A solution of NaOH has a concentration of 4 g/dm3. What is the mass of NaOH contained in 250 cm¬3 of this solution?

Answer 1

Solution:

C(NaOH) = 4 g/dm³ = 4 g/L

V_solution = 250 cm³ = 250 mL = 0.25 L

Find the mass of NaOH:

m(NaOH) = C(NaOH) × V_solution = 4 g/L × 0.25 L = 1 g

m(NaOH) = 1 g

Answer: The mass of NaOH is 1 gram.