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04.5: A sample of cognac (5 cm) was diluted with water to 50 cm in a volumetric flask. A portion of this solution (103) was distilled and the ethane collected into an acidic solution of potassium dichromate (K2Cr20, 0.16oom, Socm), where it was oxidised to acetic acid. The excess (unreacted) dichromate was back titrated against an Fe(ll) standard solution (0.1006 M, 16.24 cm). 1.63 n Calculate the ethanol concentration In the cognac proof- as %[w/V). L. 63+6 -0.272 n.olmasa no mules alethal Reactions: inmoles 2 3 си. 2 Cr20+ 3 C,H,OH + 16 H' => products 1 6 Cr:07 + 6 Fe(11) + 14 H E products 5.000 -0.222 n=cAN 4.734 Q4.6 A solid sample of zinc (11) hydroxide is added to 400 ml. of 0.550 M hydrobromic acid. The excess acid was then back titrated and required 165 mL of a 0.500 M sodium hydroxide solution. Determine the mass of the sample, assuming that it was pure zinc (11) hydroxide To aid in the prevention of tooth decay, it is recommended that drinking water contain 0.300 ppm fooride, P. How many grams of - must be added to a cylindrical water reservoir wing a dianter of 675 x 10 m and a depth of 29.52 The mass percentage of hydrochloric acid within a solution is 40.00%. Given that the density of this solution is 1.200 g/ml, find the molarity of the solution Determine the concentrations of Mas Melt, and at in a solution prepared by dissolving 151x1068 MyCiyin 1.0 Lolvater. Express all these concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (ppm).