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propiophenone + excess Br2 + excess NaOH=
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- Which is a stronger acid: one with an acid dissociation constant of 3.4 X 10-3 or one with an acid dissociation constant of 2.1 X 10-4?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?1. Which of the following is the best primary standard for the standardization of NaOH?a. KHPb. Glacial Acetic Acidc. Ascorbic Acidd. HCl acid solution 2. Which of the following is the best primary standard for the standardization of HCl?a. Na2CO3b. NaOHc. NaHCO3d. KHP
- Methanoic acid (HMeth) has a Ka of 1.78 * 10-6, so what is the pOH of a 0.23 M NaMethsolution?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?Because phenol (C6H5OH) is less acidic than a carboxylic acid, it can be deprotonated by NaOH but not by the weaker base NaHCO3. Using this information, write out an extraction sequence that can be used to separate C6H5OH, benzoic acid, and cyclohexanol. Show what compound is present in each layer at each stage of the process, and if it is present in its neutral or ionic form.
- 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 processIf I have a weak acid with a pKa of 4.65 what will be the relative ratio of [A-] to [HA] in the final mixture be to give a pH of 4.00? What if you change this to a pH of 3.00? 5.00?What is the property of Al(OH)3 which, when reacting with organic dyes, serves as confirmatory test?
- SHOW COMPLETE SOLUTIONS Q3. Which isolate has A260/280 ratio of above 2.0?Given the following reversible reactions and Kc values: (I) Self-ionization of water: H2O + H2O H3O+ + OH-, Kc = Kw = 1.0 x 10-14. (II) Ionization of a weak base: NH3 + H2O NH4+ + OH-, Kc (= Kb) = 1.8 x 10-5. a) Determine the Kc for the reaction: NH3 + H3O+ NH4+ + H2O b) Would you assess the Kc value as LARGE or small? Does your assessment make sense for this reaction, i.e. think about the species involved?Which is a stronger acid: one with an acid dissociation constant of 3.4 * 10-3 or one with an acid dissociation constant of 2.1 * 10-4?