Question Calculate the [NH3] in a solution of 0.260 M ammonium cyanide (NH4CN). Hint: Use the Ka of HCN (4.9 x 10-¹0) and the Kb of NH3 (1.8 x 10-5) to calculate Kc for the reaction NH₂(aq) + CN (aq) = NH3(aq) + HCN(aq). or pull up for additional resources
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- Given that Ka for acetic acid is 1.8 * 10-5 and that for hypochlorous acid is 3.0 * 10-8, which is the stronger acid?At 77°C, 2.00 mol of notrosyl bromide, NOBr, placed in a 1.00-L flask dissociates to the extent of (9.50x10^0)%; that is, for each mole of NOBr before reaction, (1.000-((9.50x10^0)/100)) mol NOBr remains after dissociation. Calculate the value f Kc for the dissociation reaction 2NOBr(g) ↔ 2NO(g) + Br2(g) Express your answer to three significant figures.(a) Given that Ka for acetic acid is 1.8 x 10-5 and that forhypochlorous acid is 3.0 x 10-8, which is the stronger acid?(b) Which is the stronger base, the acetate ion or the hypochloriteion? (c) Calculate Kb values for CH3COO- and ClO-.
- 4. Rank the following compounds in decreasing (strongest to weakest) order of basicity. NH₂ O₂N || NH₂ NH₂ B. II > III >> IV E. III >II>I>IV 11 ||| A. I> ||| > || > IV D. IV > III >II>I 5. Predict the product for the following reaction. CN H₂/Ni NH₂ NH₂ A. IB. II C. III D. IV E. I and II IV NH₂ C. IV> | > | > IV CN IV "NH₂Rank the following organic compounds in order of increasing basicity. I N As. = III P 11Rank the following in decreasing order with respect to relative basicity: * ČI i ii ii %3!
- 7. Explain the order of basicity NH a o CN b N-CH3 ΝΗ C". d NHArrange the following species as most stable in solution to least stable in solution using the K, of their conjugate acids. C6 H;O Ka • ClO, Cio- 1.6 x 10-10 Ka = 1.2 x 10-2 Ka = 3.5 x 10-8 Ka = 1.0 x 10-48 CH5 Most Stable lons 1 | Cio- | CiO, 3. CH3 C6 H5O .... 2. 4.3. Rank the following species by expected gas phase basicity. How does gas phase bacicity differ from these species behaviour in water or organic solvents? GN 2- 3. .N 4- N
- 51. Which is NOT a valid resonance structure for the conjugate base of this molecule? (A) (C) OEt (C) :0: : OEt (+) HBr ROOR ü (B) OCH 3 (D) 52. What is the major product of this reaction sequence? o Mg ether (A) (B) :0: (D) H OEt OEt H OEt X CH31 LOH LOCH₁Pregabalin, C3H17NO2 is used as a treatment of epilepsy and neuropathic pain. NH2 pK, = 4.2 %3D H. pK = HO, = 3.4 Select the equilibrium corresponding the to the pK, = 9.8 CgH18NO2 (aq) + H20 (I) C3H17NO2 (aq) + OH (aq) C3H16NO2 (aq) + H20 (1) CgH17NO2 (aq) + OH (aq) CgH17NO2 (aq) + H20 (1) C3H18NO2 *(aq) + OH (aq) C3H17NO2 (aq) + H20 (1) CgH16NO2 (aq)+ H30*(aq)Hypervalent iodine reagent Br ? Он THE Br 1.00 eq. 2.00 eq. please consider that there are 2 eq of Et-O-