What mass of phosphoric acid and water should be taken to prepare 450 g of its 15% solution?

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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