As a technician in a large pharmaceutical research firm, you need to produce 400. ml of 1.00 mol l−1 potassium phosphate buffer solution of ph = 7.08. the pka of h2po4− is 7.21. you have the following supplies: 2.00 l of 1.00 mol l−1 kh2po4 stock solution, 1.50 l of 1.00 mol l−1 k2hpo4 stock solution, and a carboy of pure distilled h2o. how much 1.00 mol l−1 kh2po4 will you need to make this solution? socratic. org?

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

Which formula can be used to calculate the molar mass of hydrogen peroxide

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