Here we will consider some reactions of a weak acid (HA) and a weak base (in this case, the conjugate of A). Recall that in water acids and bases undergo the following reactions: HA+ H20 H30 + A AH20 OH HA and Write expressions for K, and Kb 1) 2) Write a balanced equation for the reaction of a weak acid (HA) with a strong base, OH- (From, for example NaOH, which dissociates completely to OH in solution). Write an expression for Keq. Do you expect Keg to be small or large for this reaction? 3) Write a balanced equation for the reaction of a weak base (A) with a strong acid, H+, (From, for example, HCl which dissociates completely to Ht in solution). Write a balanced equation for this reaction. Do you expect Keg to be small or large for this reaction? 4) How do your Keg for each reaction compare to your expressions for Ka and Kb?

Here we will consider some reactions of a weak acid (HA) and a weak base (in this case, the conjugate of A). Recall that in water acids and bases undergo the following reactions: HA+ H20 H30 + A AH20 OH HA and Write expressions for K, and Kb 1) 2) Write a balanced equation for the reaction of a weak acid (HA) with a strong base, OH- (From, for example NaOH, which dissociates completely to OH in solution). Write an expression for Keq. Do you expect Keg to be small or large for this reaction? 3) Write a balanced equation for the reaction of a weak base (A) with a strong acid, H+, (From, for example, HCl which dissociates completely to Ht in solution). Write a balanced equation for this reaction. Do you expect Keg to be small or large for this reaction? 4) How do your Keg for each reaction compare to your expressions for Ka and Kb?

General Chemistry - Standalone book (MindTap Course List)

11th Edition

ISBN:9781305580343

Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Chapter16: Acid-base Equilibria

Section: Chapter Questions

Problem 16.157QP: Weak base B has a pKb of 6.78 and weak acid HA has a pKa of 5.12. a Which is the stronger base, B or...

See similar textbooks

Similar questions

Weak base B has a pKb of 6.78 and weak acid HA has a pKa of 5.12. a Which is the stronger base, B or A? b Which is the stronger acid, HA or BH+? c Consider the following reaction: B(aq)+HA(aq)BH+(aq)+A(aq) Based on the information about the acid/base strengths for the species in this reaction, is this reaction favored to proceed more to the right or more to the left? Why? d An aqueous solution is made in which the concentration of weak base B is one half the concentration of its acidic salt, BHCl, where BH+ is the conjugate weak add of B. Calculate the pH of the solution. e An aqueous solution is made in which the concentration of weak acid HA twice the concentration of the sodium salt of the weak acid, NaA. Calculate the pH of the solution. f Assume the conjugate pairs B/BH+ and HA/A are capable of being used as color-based end point indicators in acidbase titrations, where B is the base form indicator and BH is the acid form indicator, and HA is the acid form indicator and A is the base form indicator. Select the indicator pair that would be best to use in each of the following titrations: (1) Titration of a strong acid with a strong base. (i) B/BH+ (ii) HA/A (2) Titration of a weak base with a strong acid. (i) B/BH+ (ii) HA/A
Calculate the pH and pOH of a solution resulting from dissolving 0.75 grams of perchloric acid in enough water to obtain a final solution of 1500 mL. Take into account that for each mole of perchloric acid it dissociates in the aqueous medium, releasing 1 mole of hydrogen ions.
A 0.2 M solution of a weak acid HA dissociates such that 99.5% of the weak acid remains intact (i.e., remains as HA). To the nearest hundredths, what is the pH of the solution?
In a solution of 0.015 mol L-1 HBr(aq) at 25 °C (a) What are the concentrations of the hydronium, H3O+, and hydroxide, OH-, ions? (Recall that HBr is a strong acid which means it completely ionizes in water ) (b) What is the pH of the solution?
Write the equations that represent the first and third ionization steps for phosphoric acid (H3PO4) in water. (Use H3O+ instead of H+.) first ionization step: + H2O(l) + third ionization step: + H2O(l) + --- The value of Ka for acetic acid is 1.80×10-5.What is the value of Kb, for its conjugate base, CH3COO-? --- The value of Ka for nitrous acid is 4.50×10-4.What is the value of Kb, for its conjugate base, NO2-?
HA is a weak acid which is 4.0% dissociated at 0.100M. Determine the Ka for this acid.
An organic acid(HA) has a molecular weight of 100. g mol^-1, a Kow=5.6 and a Ka=2.7x10^-2. If originally 2.0g of the acid is dissolved in 100mL of octanol (there is no dissociation in octanol), which is then placed in contact with 100mL of water, what will be the pH of the water? (consider the equilibrium processes to be sequential and unrelated chemically)
(a) Acid rain is no threat to lakes in areas where the rock is limestone (calcium carbonate), which can neutralize the acid. Wherethe rock is granite, however, no neutralization occurs. How does limestone neutralize acid? (b) Acidic water can be treated withbasic substances to increase the pH, although such a procedure is usually only a temporary cure. Calculate the minimum mass oflime, CaO, needed to adjust the pH of a small lake (V = 4 x 109 L) from 5.0 to 6.5. Why might more lime be needed?
Polymers are not very soluble in water, but their solubility increases if they have charged groups. (a) Case in, a milk protein,contains many —COO⁻ groups on its side chains. How does the solubility of casein vary with pH? (b) Histones are proteins es-sential to the function of DNA. They are weakly basic due to the presence of side chains with —NH2 and =NH groups. How does the solubility of a histone vary with pH?
Complete the sentence for a strong acid, the equilibrium constant Ka is A. So small that HA is not completely dissociated b. So large that HA is completely dissociates into H3O+ and A- c. Neutral
In many reactions, the addition of AlCl3 produces thesame effect as the addition of H+.(a) Draw a Lewis structure for AlCl3 in which no atomscarry formal charges, and determine its structure using theVSEPR method.(b) What characteristic is notable about the structure in part(a) that helps us understand the acidic character of AlCl3?(c) Predict the result of the reaction between AlCl3 andNH3 in a solvent that does not participate as a reactant.(d) Which acid–base theory is most suitable for discussingthe similarities between AlCl3 and H+?
For each of the following reactions, highlight or circle the substance on the left hand side which is behaving as an acid and the substance on the right hand side which is its conjugate base. H2O + HCl ➡ H3O+ + Cl- CH3CO2H + OH ➡ CH3CO2- + H2O Justify each of your choices with concrete explanations.

SEE MORE QUESTIONS

Recommended textbooks for you

General Chemistry - Standalone book (MindTap Cour…

Chemistry

ISBN:

9781305580343

Author:

Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Publisher:

Cengage Learning

Organic Chemistry

Chemistry

ISBN:

9781305580350

Author:

William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:

Cengage Learning

General Chemistry - Standalone book (MindTap Cour…

Chemistry

ISBN:

9781305580343

Author:

Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Publisher:

Cengage Learning

Organic Chemistry

Chemistry

ISBN:

9781305580350

Author:

William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS