Can this be done in 2 hours? | Chemistry homework help
4. Special cases
a. Describe how you would prepare 500 mL of a 1.0 M solution of potassium chloride that is 93.0% pure. The gram formula weight of potassium chloride is 74.56 g/mol. Answer: Calculate the mass of impure potassium chloride needed. Carolina Biological Supply Company 2700 York Road, Burlington, North Carolina 27215 Phone: 800.334.5551 • Fax: 800.222.7112 Technical Support: 800.227.1150 • www.carolina.com
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mass of impure potassium chloride = Mpure × Vpure × gram formula weight/percent purity = 1.0 M × 0.500 L × 74.56 g/mol 0.930 = 40 g Slowly add 40 g of 93% potassium chloride to a 500-mL volumetric flask half filled with distilled or deionized water and swirl the flask to mix. When all the solid is dissolved and the solution is at room temperature, dilute to the mark and invert the flask several times to mix. b. Describe how you would prepare 500 mL of a 1.0 M solution of phosphoric acid from phosphoric acid that is 85.0% pure. The gram formula weight of phosphoric acid is 98.00 g/mol, and the density of 85.0% phosphoric acid is 1.685 g/mL. Answer: Calculate the volume of 85.0% phosphoric acid needed. volume of impure = Mpure × Vpure × gram formula weight/ phosphoric acid (percent purity × density) = (1.0 M × 0.500 L × 98.00 g/mol) 0.850 × 1.685 g/mL = 34 mL Slowly 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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