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- For 20.7 the solutions for part c and d dont seem right. Shouldn't reacting with 1 eq of H2 just take away the C=C bond and not the C=O bond. (H2 reduces C=C selectively to form a ketone according to page 738. Also the both the C=C and C=O bond should be reduced if excess H2 is usedIn extraction of caffeine from tea, CaCO3 (pKa of HCO3- is 10.3) is used to convert tannin to glucose and calcium salt of gallic acid. Explain why glucose is not in its salt form but gallic acid is. Assuming pKa of -OH of glucose is 12, and pKa of -OH of gallic acid is 9.5 and pKa of -COOH of gallic acid is 4.5.The data below give the concentration of thiol (mM) in the blood lysate of the blood of two groupsof volunteers, the first group being ‘normal’ and the second having rheumatoid arthritis (Banford, J.C.,Brown, D.H., McConnell, A.A., McNeil, C.J., Smith, W.E., Hazelton, R.A. and Sturrock, R.D., 1983,Analyst, 107: 195): Normal: 1.84, 1.92, 1.94, 1.92, 1.85, 1.91, 2.07Rheumatoid: 2.81, 4.06, 3.62, 3.27, 3.27, 3.76 Verify that 2.07 is not an outlier for the ‘normal’ group.
- Acetylene is a very weak acid; however, it will react with moist silver(I) oxide and form water and a compound composed of silver and carbon. Addition of a solution of HCl to a 0.2352-g sample of the compound of silver and carbon produced acetylene and 0.2822 g of AgCl. (a) What is the empirical formula of the compound of silver and carbon? (b) The production of acetylene on addition of HCl to the compound of silver and carbon suggests that the carbon is present as the acetylide ion, C22-. Write the formula of the compound showing the acetyl ide ion.Relationships among E° cellv G°, and KWhen BF3 behaves as a Lewis acid, the stability of the adducts with (CH3)2O, (CH3)2S, and (CH3)2Se decreases in the order in which the Lewis bases are listed. However, when the Lewis acid is B(CH3)3, the most stable adduct is that formed with (CH3)2S and the adducts with (CH3)2Se ad (CH3)2O are about equally stable. Explain the difference in stability of the adducts
- Benzoic acid (C6H5C02H) has Ka =6.3 x 10-5 a) What is the value of Kb for the benzoate ion (C6H5C02-)? b) What is the h30+ concentration of a O, 10 mol/dm3 solution of benzoic acid? c) What is the pH of the solution in (b) above?Sodium hypochlorite (NaOCl, the oxidant in household bleach) in aqueous CH3COOH is also touted as a “green” oxidizing agent. For example, oxidation of (CH3)2CHOH with NaOCl forms (CH3)2C = O along with NaCl and H2O. (a) What advantages and/or disadvantages does this method have over oxidation with HCrO4- –Amberlyst A-26 resin? (b) What advantages and/or disadvantages does this method have over oxidation with CrO3, H2SO4, H2O?outline a separation scheme for isolating pure aspirin. lab video: https://www.youtube.com/watch?v=Y4NMpO1xI8U
- Compute for the appropriate amount (mL) of the compostions below of CTAB precitpitation solution used for DNA extraction. a. 1% w/v CTAB b. 10 mM EDTA c. 50 mM Tris-ClA 0.9056 g sample of KBrO3 (MM=167.0) was dissolved in dilute HCl and treated with an unmeasured excess of KI. The liberated iodine required 37.21 mL of Na2S2O3. Calculate the molar concentration of sodium thiosulfate. 1 mol BrO3- = 3 mol I2 = 6 mol S2O32- 0.8744 M 2.623 M 0.8791 M 0.2915 Ma. For this acid-base reaction: C⊖H3 + H3O+ −−→ CH4 + H2O, the conjugate acid of carboanion (C⊖H3) is _________________ b. Complete the equation: HC≡N + NaOH −−→ ___________+__________ c. Rank the acidity of these: NH3, HF, H2O, HCl, NaH Most acidic______>_______>_______>_______>_______least acidic d. The Ka of acetic acid (found in vinega) is 1.8×10-5. Then the pKa of formic acid is
