We find the mass of acid in solution from the formula for determining the mass fraction of a substance.
W (in-va) = m (in-va) / m (solution) • 100%.
The mass of acid required to prepare the solution.
m (H3PO4) = W (H3PO4) • m (solution) / 100% = 15% • 450 g / 100% = 67.5 g.
Mass of water.
m (H2O) = m (solution) – m (in-va) = 450 g – 67.5 g = 382.5 g.
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