To 200 g of 25% NaOH was added 50 g of anhydrous alkali. Determine the mass fraction
September 28, 2021 | education
| To 200 g of 25% NaOH was added 50 g of anhydrous alkali. Determine the mass fraction of Na hydroxide in the resulting solution.
1. Find the mass of NaOH in solution:
m (NaOH) = ω * m (solution) = 0.25 * 200 = 50g.
2. Find the total mass of NaOH:
m (NaOH) = 50 + 50 = 100g.
3. Find the mass of the solution:
m (solution) = 200 + 50 = 250g.
4. Find the mass fraction of Na hydroxide in the resulting solution:
ω (NaOH) = 100/250 = 0.4 (40%).
Answer: ω (NaOH) = 40%.
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