EBK ORGANIC CHEMISTRY
12th Edition
ISBN: 9781119233664
Author: Snyder
Publisher: VST
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Chapter 3, Problem 42P
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5 ml of a 0.2 M NH3 solution are added to 5 ml of a 0.1 M NH4Cl solution (Kb for NH3 is = 1.8 × 10-5). Calculate:
a) the pH of the resulting solution;
b) the ΔpH due to the addition of 5 ml of a 0.01 M HNO3 solution to the solution resulting from part a);
c) the ΔpH due to the addition of 10 ml of water to the solution resulting from part a)
A reaction has a standard free-energy change of -13.10 kJ mol-¹(-3.131 kcal mol-¹). Calculate the equilibrium constant for the
reaction at 25 °C.
Keq =
The acid dissociation constant for a weak acid HX at 25°C is 1.9 x10-6. Calculate the free energy of formation for X–(aq) at 25°C. The standard free energies of HX(aq) and H+(aq) at 25°C are –245.4 kJ/mol and 0, respectively.
Chapter 3 Solutions
EBK ORGANIC CHEMISTRY
Ch. 3 - Prob. 1PPCh. 3 - PRACTICE PROBLEM 3.2
Write equations showing the...Ch. 3 - PRACTICE PROBLEM 3.3 Which of the following are...Ch. 3 - Prob. 4PPCh. 3 - PRACTICE PROBLEM 3.5 Formic acid (HCO2H) has...Ch. 3 - Prob. 6PPCh. 3 - Prob. 7PPCh. 3 - Prob. 8PPCh. 3 - PRACTICE PROBLEM 3.9 Predict the outcome of the...Ch. 3 - Prob. 10PP
Ch. 3 - Prob. 11PPCh. 3 - Prob. 12PPCh. 3 - Prob. 13PPCh. 3 - Prob. 14PPCh. 3 - PRACTICE PROBLEM 3.15 Nitro groups have a large...Ch. 3 - PRACTICE PROBLEM 3.16
Your laboratory instructor...Ch. 3 - Prob. 17PPCh. 3 - Prob. 18PPCh. 3 - Prob. 19PPCh. 3 - What is the conjugate base of each of the...Ch. 3 - List the bases you gave as answers to Problem 3.20...Ch. 3 - 3.22 What is the conjugate acid of each of the...Ch. 3 - List the acids you gave as answers to Problem 3.22...Ch. 3 - Rank the following in order of increasing acidity.Ch. 3 - Without consulting tables, select the stronger...Ch. 3 - Designate the Lewis acid and Lewis base in each of...Ch. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Write an equation, using the curved-arrow...Ch. 3 - 3.30 What reaction will take place if ethyl...Ch. 3 - 3.31 (a) The of formic acid. What is the? (b)...Ch. 3 - Acid HA has pKa=20; acid HB has pKa=10. (a) Which...Ch. 3 - Prob. 33PCh. 3 - 3.34 (a) Arrange the following compounds in order...Ch. 3 - 3.35 Arrange the following compounds in order of...Ch. 3 - 3.36 Arrange the following in order of increasing...Ch. 3 - Prob. 37PCh. 3 - 3.38 Supply the curved arrows necessary for the...Ch. 3 - Glycine is an amino acid that can be obtained from...Ch. 3 - 3.40 Malonic acid, , is a diprotic acid. The for...Ch. 3 - 3.41 The free-energy change, , for the ionization...Ch. 3 - 3.42 At the enthalpy change, , for the ionization...Ch. 3 - The compound at right has (for obvious reasons)...Ch. 3 - 3.44.
(a) Given the above sequence of...Ch. 3 - Prob. 45PCh. 3 - Prob. 46PCh. 3 - 3.47 As noted in Table 3.1, the of acetone, , is...Ch. 3 - Formamide (HCONH2) has a pKa of approximately 25....Ch. 3 - List all the chemical species likely to be present...Ch. 3 - Prob. 2LGPCh. 3 - Prob. 3LGPCh. 3 - Prob. 4LGP
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- Some H2PO4- and HPO42- are added to water such that the concentration of each is the same value, 5.25 mmol L-1 (pKa = 2.1, 6.8, 12.4). The water was initially at pH 6.55 and 25.0 °C. Calculate ΔGrxn in kJ mol-1. (R = 8.3145 J mol-1 K-1)arrow_forward5. One of the key steps in the tricarboxylic acid (TCA) cycle is the hydration of fumarate to malate: Fumarate-² + H₂O = Malate-2 The standard reaction Gibbs free energy and enthalpy for this reactions are -880 cal/mol and 3560 cal/mol, respectively. (a) What is the equilibrium constant for this reaction (25 °C)? (b) Is the reaction favorable (spontaneous) at 25 °C? (c) What is the equilibrium constant of this reaction under physiological conditions (37 °C)? (d) Is this reaction favorable at 37 °C?arrow_forwardThe following reaction has a AG° value of +8.43 kJ/mol at 25 °C. HA(aq) + H20(1) =H;O*(aq) + A (aq) Calculate the KA for the acid HA.arrow_forward
- Ka = 4.5 × 10-4 at 25°C of nitrous acid (HNO2). What is the ΔG value at equilibrium?arrow_forwardGiven the following data: 2C6H6 (l) + 15O2 (g) → 12CO2 (g) + 6 H2O (l) ΔG° = –6399 kJ C (s) + O2 (g) → CO2 (g) ΔG° = –394 kJ H2 (g) + ½ O2 (g) → H2O(l) ΔG° = –273 kJ Calculate ΔG° for the reaction 6 C(s) + 3 H2(g) ----> C6H6(l) ΔG° = ???arrow_forwardFor a reaction with ΔH° = 40 kJ/mol, decide which of the following statements is (are) true. Correct any false statement to make it true. (a) The reaction is exothermic; (b) ΔG° for the reaction is positive; (c) Keq is greater than 1; (d) the bonds in the starting materials are stronger than the bonds in the product; and (e) the product is favored at equilibrium.arrow_forward
- Why is ΔTmetal < 0? Why is ΔTwaterarrow_forwardThe pKb of the organic base nicotine (denoted Nic) is 5.98. Write the corresponding protonation reaction, the deprotonation reaction of the conjugate acid, and the value of pKa for nicotine.arrow_forwardA student determines the value of the equilibrium constant to be 8.18x10-37 for the following reaction. H₂S(g) + 2H₂O(l)—3H₂(g) + SO₂(g) Based on this value of Keq: AG° for this reaction is expected to be (greater, less) zero. than Calculate the free energy change for the reaction of 1.68 moles of H₂S(g) at standard conditions at 298K. AG rxn= kJarrow_forward
- For the following acid-base reaction, (1) predict the products, showing both reactants and products complete Lewis structures and arrows showing electron flow; (2) label each structure with the lowing: Bronsted acid, Bronsted base, conjugate acid, conjugate base; (3) give a brief definition of a ronsted acid and Bronsted base; (4) predict the direction of the equilibrium and justify your answer. HC0OH + CH3 Nta PRん106Y pkb = 3.36arrow_forwardConsider the ionization of nitrous acid at 25 °C: HNO2(aq) + H2O(l)H3O+(aq) + NO2–(aq) ΔG° = 19.1 kJ·mol–1What is the value of K for this equilibrium? 2.2 2.0×10–7 2.2×103 4.5×10–4arrow_forwardCalculate the value of Δ?∘rxnΔGrxn∘ for the following reaction at 278 K. Ka = 2.9 × 10–8 and assume Ka does not change significantly with temperature. HClO(aq) + H2O(l) <--> ClO-(aq) + H3O+(aq)arrow_forward
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