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5 January, 12:46

A 20.0 % by mass solution of phosphoric acid (H3PO4) in water has a density of 1.114 g/mL at 20°C. What is the molarity of this solution?

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  1. 5 January, 13:32
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    Assume you have 1 L of the material (you can assume any volume you want, you'll get the same answer).

    Using the density, the one L has a mass of 1114 g

    20% by mass of phosphoric acid means the mass of phosphoric acid is 0.20 * 1114 g

    Calculate the moles of phosphoric acid

    Molarity, M, mole / L = moles of acid / volume or 1 L
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