5 grams of sodium hydroxide NaOH was dissolved in 120 grams of water.

univerkov | June 9, 2021 | education

5 grams of sodium hydroxide NaOH was dissolved in 120 grams of water. Determine the percentage of alkali in the solution.

Find the mass of the resulting solution after adding sodium hydroxide.
m (solution) = m (H2O) + m (NaOH) = 120 g + 5 g = 125 g.
Mass fraction of alkali in solution.
W (NaOH) = m (NaOH) / m (solution) • 100% = 5 g / 125 g • 100% = 4%.

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