Formamide
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- a) If the pH value of an aqueous solution of trimethylamine [(CH3)3N] is 10.75, what should be the molarity of this solution? (CH3)3N + H2O ↔ (CH3)3NH+ + OH-, Kb = 6,3 × 10-5 b) What will be the pH of the solution prepared by dissolving 8.35 g of aniline hydrochloride (C6H5NH3+Cl-) in 750 mL of 0.215 M aniline (C6H5NH2)? Is this solution an effective buffer? Explain (Kb = 7,4 × 10-10 for aniline, C: 12.0 g / mol, H: 1.0 g / mol, N: 14.0 g / mol, Cl: 35.4 g / mol) .arrow_forwardpropanoic acid + methanol (in concentrated sulfuric acid)arrow_forwardSuggest a possible structure for Compound X.arrow_forward
- a) If the pH value of an aqueous solution of trimethylamine [(CH3) 3N] is 10.75, what should be the molarity of this solution? (CH3) 3N + H2O ↔ (CH3) 3NH + + OH-, Kb = 6.3 × 10-5 b) What will be the pH of the solution prepared by dissolving 8.35 g of aniline hydrochloride (C6H5NH3 + Cl-) in 750 mL of 0.215 M aniline (C6H5NH2)? Is this solution an effective buffer? Explain (Kb = 7.4 × 10-10 for aniline, C: 12.0 g / mol, H: 1.0 g / mol, N: 14.0 g / mol, Cl: 35.4 g / mol) .arrow_forwardPlace the binders below in descending order of acidity (pi) and justify your choice: CH3CN; (C2H5)2O; PCl3; As(C6H5)3; (C2H5)3Narrow_forwardUsing your knowledge on structural effects, account for the following observations by giving appropriate explanations. 1) Boron trifluoride (BF3) is a stronger Lewis acid than trimethyl borate [(CH3O)3B]. 2) Piperidine is a much stronger Lewis base than pyridine.arrow_forward
- 1. Write the equilibrium-constant expressions and obtain numerical values for each constant in(a) the basic dissociation of aniline, C6H5NH2 .(b) the acidic dissociation of hypochlorous acid, HClO.(c) the acidic dissociation of methyl ammonium hydrochloride, CH3NH3Cl.(d) the basic dissociation of NaNO2 .(e) the dissociation of H3AsO3 to H3O + and AsO33- 2. The chemicals A and B react as follows to produce C and D: A + B ↔ C + DKe = [C] [D] [A] [B] The equilibrium constant Ke has a value of 0.30. Assume 0.20 mol of A and 0.50 mol of B are dissolved in 1.00 L, and the reaction proceeds. Calculate the concentrations of reactants [A], [B] and products [C], [D] at equilibrium. Using step-by-step processarrow_forward(2) Caffeine (C8H10N4O2) is a weak base with a pKь of 10.4. Calculate the pH of a solution containing a caffeine concentration of 455 mg/L.arrow_forwardCalculate the pH of a 0.105 M solution of ethylenediamine (H,NCH,CH,NH,). The pKa values for the acidic form of ethylenediamine (H†NCH,CH,NH) are 6.848 (pKa1) and 9.928 (pK22). pH Calculate the concentration of each form of ethylenediamine in this solution at equilibrium. [H,NCH,CH,NH,] = M [H,NCH,CH,NH; 1 = M [HNCH,CH,NH] = Marrow_forward
- (a) Explain how NaBH, in CH;OH can reduce hemiacetal A to 1,4-butanediol (HOCH,CH,CH,CH,OH). (b) What product is formed when A is treated with Ph;P=CHCH,CH(CH),? (c) The drug isotretinoin is formed by reaction of X and Y. What is the structure of isotretinoin? Although isotretinoin (trade name Accutane or Roaccutane) is used for the treatment of severe acne, it is dispensed under strict controls because it also causes birth defects. PPha NaOCH,CH3 HO- isotretinoin HO A Br X Yarrow_forwardComplete the following equation for the dissociation of butyric acid in water, so as to illustrate unambiguously that butyric acid is a weak acid: CH3CH2CH2COOH(aq)+ H20(1)arrow_forwardUsing the data in Appendix C, determine which of the following bases is strong enough to deprotonate acetonitrile (CH3CN), so that equilibrium favors the products: (a) NaH; (b) Na2CO3; (c) NaOH; (d) NaNH2; (e) NaHCO3.arrow_forward
- Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningIntroduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage LearningOrganic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning