Find the mass of water and sodium chloride required to prepare 500 g of physiological solution, the mass fraction of salt in which is 0.09

Given: ω (salt) = 0.09, m (solution) = 500 g.
Find: m (salt) – ?, m (water) -?
Decision.
1. Find the mass of the solute (salt) in the solution:
m (salt) = m (solution) • ω (salt) = 500 g • 0.09 = 45 g.
2. Find the mass of the solvent (water):
m (water) = m (solution) – m (salt) = 500 g – 45 g = 455 g.
Answer: m (salt) = 45 g, m (water) = 455 g.

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