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A: on doing A thin-layer chromatography (TLC) experiment was run using three compounds: benzophenone,…
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Why is the mixture extracted with sodium bicarbonate? Give an equation and explain its relevance.
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- If you were told to provide a chemical formula for a compound such as dinitrogen tetroxide, state a strategy for how to solve the problem in 2 to 4 sentences. Just a broad strategy you would use for any compound.A student weighs out exactly 1.562 grams of p-aminophenol and exactly 40 mL of water. After dissolving p-aminophenol in HCl, 10 mL of acetic anhydride is added. The student follows the procedure and acetaminophen is prepared. What is the maximum amount of acetaminophen she could obtain from the reaction if the percentage yield is 76%?2-chlorobenzoic acid (C 6 H 4 ClCOOH) is produced by diazotization. 6.25 g of anthranilic acid (0-aminobenzoic acid, C 6 H 4 NH 2 COOH) is allowed to react with 3.5 g of sodium nitrite in hydrochloric acid solution, whereby diazonium (C 6 H 4 N 2 ClCOOH) is formed. 4.5 grams of Cu(I) chloride are dissolved in conc. hydrochloric acid and 5 mL of water, after which the diazonium solution is added, whereby 2-chlorobenzoic acid is formed. The acid is separated and purified by recrystallization. 3.02 grams of product is obtained. Calculate the yield.
- You were assigned to assay a product sample of milk of magnesia. A 0.600-g sample was reacted with 25.00 mL 0.10590 N H2SO4. The excess unreacted acid in the solution required 13.00 mL of 0.09500 N NaOH when titrated to reach the methyl red end point. In terms of Mg(OH)2 content, does the sample product conform to the USP requirement? Justify your answer through calculations.The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00-mL sample to 100.00 mL. A 19.00-mL portion of the diluted solution was refluxed with 40.00 mL of 0.04601 M KOH: CH3 СОО С2H; + ОН — СH3 COO + C2H; ОН After cooling, the excess OH was back-titrated with 3.02 mL of 0.05056 M H2 SO4. Calculate the amount of ethyl acetate (88.11 g/mol) in the original sample in grams. Amount of ethyl acetate =The digestion of a 0.1159 gram sample of a phosphorous-containing compound in a mixture of HNO3 and H2SO4 resulted in the formation of CO2, H2O, and H3PO4. Addition of ammonium molybdate yielded a solid having the composition (NH4)3PO4·12MoO3 (FW = 1876.3). This precipitate was filtered, washed, and dissolved in 50.00 mL of 0.2000 M NaOH: (NH4)3PO4•12MoO3(s)+26OH-(aq)->HPO42-(aq)+12MoO42-(aq)+14H2O(l)+3NH3(g) After the solution was boiled to remove the NH3, the excess NaOH was back-titrated with 14.84 mL of 0.1626 M HCl to a phenolphthalein end point. Calculate the percent phosphorous (FW = 30.9737) in the sample.
- Why is carbon chemistry clearly complex?a) Compare between equivalence point and endpoint. Distinguish which point comes first. b) Sulfanilamide, C6H4N2O2S is a sulfonamide antibacterial drug. The purity of sulfanilamide (168.18 g/mol) can be determined by the following steps. First, oxidize sulfur to SO₂ gas. Next, allow SO₂ gas generated to pass through H₂O₂ to produce H₂SO4. The acid is then titrated with NaOH standard solution. Given a 0.5136 g of sulfanilamide sample required an average titre volume of 48.13 mL 0.1251 M NaOH. Suggest a suitable indicator to be used in this titration and predict the purity of sulfanilamide being analysed. (Note: 1 mol sulfanilamide = 1 mol H₂SO4)There are many organic acids and bases in our cells, and their presence modifies the pH of the fluids inside them. It is useful to be able to assess the pH of solutions of acids and bases and to make inferences from measured values of the pH. A solution of equal concentrations of lactic acid and sodium lactate was found to have pH= 3.08. (a) What are the values of pKa and Ka of lactic acid? (b) What would the pH be if the acid had twice the concentration of the salt?
- Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr -OH • NH, indophenol anion To determine the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL. of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 mL of a 5.50 x 10-4 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 ml. of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Sample Absorbance (625 nm) A 0.374 В 0.621 0.045…Describe the preparation of 500 mL 0.50 M K2Cr2O7 solution using solid K2Cr2O7 (purity: 99.8%). What is the volume of NaOH needed to dilute 1.50 M NaOH to 250 mL of 0.10 M. Calculate the volume of 0.1 M HCl needed to react with 50 mL of 0.89 M NaOH. Consider the reaction of 10 g KClO3 and 5g P4. Identify the limiting reagent Identify the excess reagent How much product is formed? (Calculate per product)"After standardization, silver nitrate must be stored in amber bottle and at room temperature with proper ventilation." True False