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To calculate the volume of the solution required, we need to determine the amount of NH3 present in the solution.
Step 1: Calculate the mass of the 0.320M NH3 solution.
Mass = Volume × Density
Mass = 425 mL × 0.898 g/mL
Mass = 381.35 g
Step 2: Determine the amount of NH3 in the 381.35 g of solution.
Amount of NH3 = (Mass of NH3 / Total mass of solution) × 100
Amount of NH3 = (28.0 / 100) × 381.35 g
Amount of NH3 = 106.79 g
Step 3: Calculate the volume of the solution required to have 106.79 g of NH3.
Volume = (Amount of NH3 / Density)
Volume = 106.79 g / 0.898 g/mL
Volume ≈ 118.9 mL
Therefore, approximately 118.9 mL of the 28.0% NH3 solution is required to make a 425 mL 0.320M NH3 solution.