1. What are the important considerations in determining the % ash content and elemental contents of plants under investigation? 2. Suggest other methods of analysis of commercial herbal drugs. Enumerate and discuss each
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1. What are the important considerations in determining the % ash content and elemental contents of plants under investigation?
2. Suggest other methods of analysis of commercial herbal drugs. Enumerate and discuss each.
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- 1. A sample of ultrapure silicon was reacted with excess oxidizing yielding SiO2. After proper filtration and drying, the precipitate weighed 3.1754 g. If ultrapure silicon is 99.98% Si, what mass of sample was used?2. If you mass 0.430 g of Co(NO3)2-6H2O and dissolve it in water, what further information would you need to calculate: a. The number of moles of Co(NO3)2 in the solution? 12° b. The molarity of the solution?What is the quantity of nitric acid and ammonia (kg) needed to produce one ton of ammonium nitrate? I learned that the concentration of nitric acid used in the process is 47% and the concentration of ammonia gas is 100%, knowing that There is a loss of ammonia and nitric acid of 3.5 and 7.5 kg, respectively
- 17.The complete combustion of 9.25 g of a compound of molar massM= 74g- mol" containing carbon, hydrogen, and oxygen yielded 11.20 dm of carbon(IV) oxide measured under normal conditions and 11.25 g of water. Determine, with appropriate calculations, the actual formula of this compound.Acetaminophen, a popular drug taken as pain reliever and fever reducer, is produced together with acetic acid from the reaction of 3.05 g 4-aminophenol and 4.1 ml of acetic anhydride. Acetaminophen was extracted at 60% yield. Density of acetic anhydride at 20 C, 1.08 g/ml. Calculate the actual no. of grams of acetaminophen produced. [Determine L.R., E.R.]A concentration of carbon monoxide of 4000 ppm (0.400 % by mass) in air is lethal in about half an hour. What mass in grams of carbon monoxide in a car with an internal volume of 2.9 m3 is sufficient to provide that concentration? Assume the density of air is 1.29 g/L ; 1m3=1000L.
- 1. Write the chemical equation for the reaction of washing soda, Na2CO3, with HCl. 2. Write the chemical equation for the reaction of baking soda, NaHCO3, with HCl. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.A mixed with extraneous matter sample containing aluminum (Al) weighs 1.35 g. the sample a was precipitated as Al (OH)3 and ignited at 1230°C to yield a precipitate of Al2O3 weighing 255.00 mg. Calculate the mass percent of Al in the sample. given that: Molar Mass of aluminum = 27.00 g/mol and Molar Mass of Al2O3 =102.00 g/mol .A sample of feldspar (feldspars are the most abundant mineral group on Earth) was analysed that weighed 1.0600 grams. From this sample, a mixture of the chlorides of sodium and potassium was obtained that weighed 0.2137 grams. Subsequent treatment with chloroplatinic acid converted the potassium into potassium hexachloroplatinate (K2PtCl6 ) that weighed 0.4910 grams. What is the percent of Na2O in the original sample of feldspar? Molar Mass NaCl: 58.44 g/mol Molar Mass KCl: 74.5513 g/mol Molar Mass K2PtCl6: 485.99 g/mol Molar Mass Na2O: 61.979 g/mol
- b. (i) (ii) A green solid has the empirical formula FeBr3·5NH3 H₂O. Upon reaction with an excess of aqueous AgNO3 it is found that 1 mole of the solid precipitates 3 moles of AgBr. Heating the green solid leads to loss of 1 mole of H₂O to yield a blue solid with the same ratio of Fe:Br:NH3 as found in the green solid. The reaction of 1 mole of the blue solid with excess of aqueous AgNO3 produces 2 moles of AgBr. Draw and name the octahedral green and blue complexes. An octahedral complex having the formula [M(dien)(NH3)(OH₂)F] has a total of 15 isomers. In the sum formula "dien" represents the tridentate diethylenetriamine ligand, which can adopt meridional or facial coordination modes. Draw structures of 8 possible isomers, clearly showing any pairs of enantiomers. The tridentante ligand may be abbreviated as below for simplicity. H₂N : = ΝΗ NH :NH2 N diethylenetriamine (dien) N NComplete the equation (including states) below. Note: Write formula with numbers not in subscript format eg. H2O(1), CO2(g). → K2SO4(aq) + 2H2O01. Sodium reacts with water according to the following reaction: Identify the oxidizing agent, and reducing agent 2 Na (s) + 2 H2O (l) 2 NaOH (aq) + H2 (g) 2. Write the correct balanced equation for the combustion of butane (C4H10)