Consider the following equilibrium for nitrous acid, HNO2 a weak acid: HNO2 (aq) + H2O (l) <-> H30' (aq) + NO2(aq) ΔΗ > O 麷 m In which direction ( shift, if: -a) NaOH is added? Left, Right or No effect will the equilibrium Select l - b) NaNO2 is added? I Select ] c) HCI is added? I Select ] d) The acid solution is made more dilute? l Select Next

Consider the following equilibrium for nitrous acid, HNO2 a weak acid: HNO2 (aq) + H2O (l) <-> H30' (aq) + NO2(aq) ΔΗ > O 麷 m In which direction ( shift, if: -a) NaOH is added? Left, Right or No effect will the equilibrium Select l - b) NaNO2 is added? I Select ] c) HCI is added? I Select ] d) The acid solution is made more dilute? l Select Next

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter13: Acids And Bases

Section: Chapter Questions

Problem 58QAP: Consider citric acid, H3C6H5O7, added to many soft drinks. The equilibrium constants for its...

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Ka for acetic acid at 25.0C is 1754 105. At 55.0C, Ka is 1.625 105. What are H and S for the ionization of acetic acid?
Acetic acid is a weak acid that dissociates into the acetate ion and a proton in aqueous solution: HC2H3O2 (aq) --><-- C2H3O2- (aq) + H+ (aq) At equilibrium at 25 °C a 0.100 M solution of acetic acid has the following concentrations: [HC2H3O2] = 0.0990 M, [C2H3O2-] = 1.33 × 10-3 M and [H+] = 1.33 × 10-3 M. The equilibrium constant, Keq, for the ionization of acetic acid at 25 °C is ________.
Consider the following aqueous chemical equilibrium of benzoic acid, a weak acid: C6H5COOH(aq) + H2O(l) is in equilibrium with H3O+(aq) + C6H5COO-(aq) a. The addition of H3O+(aq) to the chemical equilibrium will have what effect on the amount (moles) of C6H5COO-(aq) in the system? b. Addition of OH-(aq) to the chemical equilibrium will have what effect on the amount (moles) of C6H5COOH(aq) in the system? c. Removal of C6H5COO-(aq) from the chemical equilibrium will have what effect on the amount of (moles) H3O+(aq) in the system? d. Increasing the pH of the solution will have what effect on the amount (moles) of C6H5COOH(aq) in the system?
K = 1.3x10^-10 for reaction HC6H5O(aq) <--> H+(aq) + C6H5O-(aq). In which direction is the equilibrium favored?
The acid-dissociation constant for chlorous acid (HClO2) is1.1 x 10-2. Calculate the concentrations of H3O+, ClO2-,and HClO2 at equilibrium if the initial concentration ofHClO2 is 0.0125 M.
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOH (aq) + H2O (l) C6H5COO- (aq) + H3O+ (aq) The pKa of this reaction is 4.2. In a 0.62 mol L^-1 solution of Benzoic acid, what percentage of the molecules are ionized? Express your answer to two significant figures and include appropriate units.
Show your understanding of the relationship between Keq and Q. If the reaction in #18, above, is at equilibrium when Keq = 4.0, explain whether or not the reaction is at equilibrium.
The equilibrium at 25 °C MaCl5 (aq) + 4 H2O (l) ↔ H3MaO4 (aq) + 5 HCl (aq) Kc = 5500 ΔH°(rxn) = 28.1 kJ/mol, Determine the ΔG°(rxn)
What is ∆G0 for the reaction CN- + H2O = HCN + OH-? Ka for HCN = 4.0x10-10. R = 8.314 J/(mol*K)
You did not divide by any reactants for Q. Is that becuase the concentration of HNO2 is 1 M? ...and if so, why would it not be 0.5M?
1) Vinegar sold commercially is typically 0.8−1.0 M acetic acid. A 1.00 M solution of acetic acid is measured by its pH to have an equilibrium concentration of 4.19×10−3 M for both acetate ions and hydronium ions at room temperature. Assuming [HOAc]0 = 1.00 M, what is the equilibrium concentration of undissociated acetic acid [HOAc]eq to the correct number of significant figures? 2) What is the value of the equilibrium constant Keq for the dissociation according to the concentrations from number 1? 3) Creating the concentrated acetic acid solution by dissolving liquid HOAc in water raises the temperature of the water by about 5 °C from room temperature. At 50 °C, do you expect the solution to contain more or less acetate ion OAc– than what you calculated in (2)? Why?
Show the equilibrium hsoft and what caused the shift?

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