1. A 0.8612-g sample of a mixture consisting of NaBr, NaI, and NaNO 3 was analyzed by adding AgNO3 to precipitate the Br1- and I1-, yielding a 1.0186-g mixture of AgBr and AgI. The precipitate was then heated in a stream of Cl2, converting it to 0.7125 g of AgCl. Calculate the %w/w NaNO3 in the sample.
2. A 347.5-mg sample of meat was analyzed for its nitrogen content using Kjeldahl Method. Upon digestion, the ammonia liberated was collected in 150 mL of 0.6 M H 3BO3 solution. The resulting solution was titrated with 45.5 mL of 0.0122 M HCl using mixed indicator. Determine the percentage of protein in the sample using 6.25 as factor for meat products.
3. A series of samples consisting of any possible combination of KCl, NaCl, and NH 4Cl is to be analyzed by adding AgNO3 to precipitate AgCl. What is the minimum volume of 5% w/v AgNO3 necessary to completely precipitate the chloride in any 0.5-g sample?