# 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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