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- Calculate NaCl equivalent of a 1% solution of pilocarpine nitrate. Pilocarpine nitrate has molecular weight of 271 and i of 1.8 (Give clear handwritten answer)A sample is analyzed for chloride by the Volhard method. Calculate the %KCl from the following data: Wt of sample = 0.5000g; Vol of AgNO3 added = 35.00ml; M of AgNO3 = 0.1157; Vol of SCN- used for back titration = 14.71ml; M of SCN- = 0.08598; Atomic wts: Ag = 107.87, N = 14.00, Cl = 35.5, O = 16.00A doxycycline calcium syrup is preserved using 0.08% w/v methylparaben, 0.02% w/v propylparaben, and 0.10% w/v sodium metabisulfite. Express each as ratio strengths.
- A 500.0mg of butter was warmed and shaken vigorously with water. The undissolved material was removed by filtering and the aqueous portion was made 1.0M in HNO3 and 0.025M in Fe(NO3)3. This acidified solution was treated with 10.00ml of 0.1755M AgNO3 to precipitate the chloride ion and, after the addition of a small amount of nitrobenzene, 14.22ml of 0.1006M KSCN was required to back titrated the excess Ag+. Calculate the % NaCl in the butter.A pain reliever is soluble in cold water to the extent of 1.0g/1310 mL and soluble in diethylether to the extent of 1.0/90 mL. What is the approximate distribution coefficient?2. A sample of material contains for its active components NaOH, NazCO3, NaHCO3, or compatible mixtures of these. Two samples, each weighing 1.000 g, are dissolved in H20. To one sample phenolphthalein is added and the solution is titrated cold with 1.038 N acid, of which 17.96 mL is required. The other sample is titrated cold, with methyl orange as indicator, and 21.17 mL of the same acid is required. What alkalis are present, and what is the percentage of each in the original sample?
- 6. The quantitative determination of pyridoxine hydrochloride can be carried out by methods: A. Complexometry B. Argentometry C. Alkalimetry D. Acid-base titration in a protogenic solvent medium E. Acid-base titration in a profile solvent mediumHow many milliliters of 2.15 wt% dimethylglyoxime solution should be used to provide a 50.0% excess with 0.998 4 g of steel containing 2.07 wt% Ni? Thedensity of the dimethylglyoxime solution is 0.790 g/mL.On the direct iodometric titration experiment, Standardization of Na2S2O3 with KIO3 standard solution, why is it better to replace with iodine solution and HCl(as a catalyst) to make safer solvent and auxiliaries( reduced toxic waste)? explain why should we use iodine solution and HCl(as a catalyst) instead of Na2S2O3 with KIO3 ?
- Find the conc of free Mg2+ in 0.050 M Na2[Mg(EDTA)](i.e. MgY2-) at pH 9.00.1. an accurately weighed chelometric standard calcium carbonate of 150 mg was used to standardize Disodium ethylenediaminetetraacetate, using the same procedure set by the monograph. The total volume of EDTA consumed was 37.5 ml . Calculate the molarity and normality of the standard solution. 2. A 0.62L of 0.072N silver nitrate was used to titrate three samples of sodium lauryl sulfate with 2500 mg,5000mg, and 6750 mg respectively. Tabulate its data, calculate the %NaCl in each sample , did any sample conformed to the official requirement?(b) The distribution ratio for X between n-hexane and water is 8.9. Calculate the concentration of X remaining in the aqueous phase after 50.0 mL of 0.200 M X is treated by extraction with the following quantities of n-hexane?