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b. Describe how you would prepare 500 mL of a 1.0 Msolution of phosphoric acid from 85.0% phosphoricacid that is pure. The gram formula weight ofphosphoric acid is 98.00 g/mol, and the density of85.0% phosphoric acid is 1.685 g/mL. |
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Answer» Calculate the volume of 85.0% phosphoric acid needed. volume of impure phosphoric acid = M pure × V pure × gram formula weight / (percent purity x density) = (1.0 M × 0.500 L x 98.00 g/mol) ÷ 1.685 g/mL0.850 = 34 mLSlowly add 34 mL of 85.0% phosphoric acid to a 500-mL volumetric flask half-filled with distilled or deionized water and swirl the flask to mix. Once the solution is at room temperature, dilute to the mark with water and invert the flask several times to mix. |
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