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11 Nov 2019
5. You would like to make a sodium phosphate buffer in the lab (pKa 2.12, pKa2 6.86, and pKas 12.4). The instructions call for preparing two stock solutions: (A) dissolve 15.20 g of sodium phosphate monobasic monohydrate in water to a final volume of 400.0 mL (B) dissolve 33.65 g of sodium phosphate dibasic heptahydrate in water to a final volume of 600.0 mL If you would like to prepare 750 mL of 0.0500 M sodium phosphate buffer of pH 6.10, how much of the stock solutions (A) and (B) do you need to mix, and how much water to do you need to add to obtain 750 mL of buffer? (10 points) Solution (A) volume (mL) Solution (B) volume (mL) Additional water volume (mL)
5. You would like to make a sodium phosphate buffer in the lab (pKa 2.12, pKa2 6.86, and pKas 12.4). The instructions call for preparing two stock solutions: (A) dissolve 15.20 g of sodium phosphate monobasic monohydrate in water to a final volume of 400.0 mL (B) dissolve 33.65 g of sodium phosphate dibasic heptahydrate in water to a final volume of 600.0 mL If you would like to prepare 750 mL of 0.0500 M sodium phosphate buffer of pH 6.10, how much of the stock solutions (A) and (B) do you need to mix, and how much water to do you need to add to obtain 750 mL of buffer? (10 points) Solution (A) volume (mL) Solution (B) volume (mL) Additional water volume (mL)
Hubert KochLv2
11 Mar 2019