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Ka and Kb Solutions Library

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128 solutions

Ka and Kb

Q. Given that Kb for C6H5NH3+ is 1.7 x 10-9 at 25 °C, what is the value of Ka for C6H5NH3+ at 25 °C? Ka=____?

Solved • May 1, 2020

Ka and Kb

Q. Given that Ka for HClO is 4.0 x 10-8 at 25 °C, what is the value of Kb for ClO- at 25 °C? Kb =____?

Solved • May 1, 2020

Ka and Kb

Q. Which of the following acids is the strongest? The acid is followed by its Ka value. A) HF, 3.5 x 10-4 B) HCIO2 1.1 x 10-2 C) HNO2 4.6 x 10-4 D) HC...

Solved • Apr 29, 2020

Ka and Kb

Q. Given that Kb for (CH3)3N is 6.3 × 10-5 at 25 °C, what is the value of Ka for (CH3)3NH at 25 °C?

Solved • Apr 23, 2020

Ka and Kb

Q. Given that Ka for HIO is 3.2 × 10-11 at 25 °C, what is the value of Kb for IO– at 25 °C?

Solved • Apr 23, 2020

Ka and Kb

Q. Given that Kb for CH3NH2 is 5.0 × 10-4 at 25 °C, what is the value of Ka for CH3NH3 at 25 °C?

Solved • Apr 23, 2020

Ka and Kb

Q. Given that Ka for HF is 6.3 × 10-4 at 25 °C, what is the value of Kb for F– at 25 °C?

Solved • Apr 23, 2020

Ka and Kb

Q. The pH of 0.10 M HOCl is 4.23. Calculate Ka for hypochlorous acid.Calculate pKa for hypochlorous acid.

Solved • Apr 21, 2020

Ka and Kb

Q. Calculate the acid ionization constant (Ka) for the acid.A 0.180 M solution of a weak acid (HA) has a pH of 2.94.

Solved • Apr 21, 2020

Ka and Kb

Q. The Kw for water at 0 °C is 0.12× 10–14. Calculate the pH of a neutral aqueous solution at 0 °C.Is a pH = 7.25 solution acidic, basic, or neutral a...

Solved • Apr 14, 2020

Ka and Kb

Q. Determine the dissociation constants for the following acids. Express the answers in proper scientific notation where appropriate.Acid            p...

Solved • Apr 14, 2020

Ka and Kb

Q. Rank acetic acid (HC2H3O2), hydrocyanic acid (HOCN), and hydrofluoric acid (HF) in order of increasing strength.Acid                             Ka...

Solved • Feb 18, 2020

Ka and Kb

Q. The Ka for hydrocyanic acid, HCN, is 6.8 × 10–10. What is Kb for the cyanide ion, CN-?A) 1.5 × 10–11B) 1.5 × 10–5C) 1.5 × 109D) 6.8 × 1010E) 6.8 × ...

Solved • Feb 17, 2020

Ka and Kb

Q. Which of the following is the correct value of Kb for nitrite (NO2-) given that Ka for nitrous acid (HNO2) is 7.1 x 10-4?A. 7.1 x 10-4B. 1.4 x 103C...

Solved • Feb 10, 2020

Ka and Kb

Q. Which of the following statements regarding acids and bases is/are correct?I For an acid and its conjugate base, pKa + pKb = 10-14II An Arrhenius b...

Solved • Feb 6, 2020

Ka and Kb

Q. Calculate Ka for the conjugate acid of methylamine, CH2NH2 (Kb= 4.4 x 10-4).a. 3.91x10-11b. 6.16x10-9c. 2.27x10-11d. 5.51x10-9e. 1.13x10-8

Solved • Jan 24, 2020

Ka and Kb

Q. What is Kb for pyridine (C5H5N) if Ka for its conjugate acid is 5.9 x 10-6 at 25°C?A) 1.7 x 10-9 B) 5.9 x 108C) 1 x 1014D) 1.7 x 1019 

Solved • Dec 19, 2019

Ka and Kb

Q. Which of the following acids has the weakest conjugate base? a. 3-chlorobenzoic acid,  Ka = 1.5x10-4b. hypochlorous acid, Ka = 2.9x10-8c. formic ac...

Solved • Dec 19, 2019

Ka and Kb

Q. Given the following pKa values, which is the strongest acid of those listed in the answers?HClO2 (pKa = 2.00)CCl3COOH (pKa = 0.52)HIO3 (pKa = 0.77)...

Solved • Dec 17, 2019

Ka and Kb

Q. Given the following values of pK, which is the weakest base of those listed in the answers?pKb of NH3 = 4.75pKa of HNO2 = 3.37pKb C5H5NH = 8.75pKa ...

Solved • Dec 16, 2019

Ka and Kb

Q. Given the following pKa values, which is the strongest acid of those listed in the answers?HClO2 (pKa = 2.00)CCl3COOH (pKa = 0.52)HIO3 (pKa = 0.77)...

Solved • Dec 12, 2019

Ka and Kb

Q. Given the following values of pK, which is the weakest acid of those listed in the answers?pKb of NH3 = 4.75pKa of HNO2 = 3.37pKb of  C5H5NH = 8.75...

Solved • Dec 11, 2019

Ka and Kb

Q. Given the following Kb values, rank the conjugate acids of these bases in order of increasing acid strength.HS–                Kb = 1.0 × 10–7HCOO–...

Solved • Nov 18, 2019

Ka and Kb

Q. In a sample of pure water at 80 °C, the pH was determined to be 6.182. What is the value of Kw at 80 °C?A. 1.00 × 10–14 B. 4.33 × 10–13 C. 2.97 × 1...

Solved • Nov 18, 2019

Ka and Kb

Q. Given that the [H3O+] of pure water is 7.24 × 10–7 M at 100 °C, determine pKw of pure water at this temperature.A. 6.14 B. 12.3 C. 7.24 D. 14.0 E. ...

Solved • Nov 18, 2019

Ka and Kb

Q. Given a weak acid HA and the following equilibrium in water:HA(aq) ⇌ H+(aq) + A–(aq)which answer describes a situation where Kb for the conjugate b...

Solved • Nov 12, 2019

Ka and Kb

Q. At 40 °C, the value of Kw = 2.92 × 10–14. An acidic solution at 40 °C will therefore have:A. [H3O+] > [OH–] and [H3O+] = 1.70 × 10–7 MB. [H3O+] ...

Solved • Nov 12, 2019

Ka and Kb

Q. The value of Ka at 25 °C for ascorbic acid (HC6H7O6 , vitamin C), is 8.0 × 10–5. What is pKb of the ascorbate ion?A. 4.1 B. 9.9 C. 10.3 D. 6.1 E. 8.9

Solved • Nov 12, 2019

Ka and Kb

Q. Which of the following is the strongest acid?A. HF                             Ka = 6.8 × 10–4B. HClO                         Ka = 3.0 × 10–8C. HNO...

Solved • Nov 12, 2019

Ka and Kb

Q. Acidity of the hypohalous oxyacids (YOH) as a function of electronegativity of Y.At equilibrium, which of the two species with a halogen atom (gree...

Solved • Dec 13, 2018

Ka and Kb

Q.  K a for acetic acid is 1.8 x 10-5. What is the first digit of the pK a value for acetic acid?

Solved • Dec 13, 2018

Ka and Kb

Q. Write a chemical equation that illustrates the autoionization of water.

Solved • Dec 13, 2018

Ka and Kb

Q. Use the acid-dissociation constants in the following table to arrange these oxyanions from strongest base to weakest.SO32-, PO42-, SO42-, CO32-Name...

Solved • Dec 13, 2018

Ka and Kb

Q. Butyric acid is responsible for the foul smell of rancid butter. The pKa of butyric acid is 4.84.Calculate the pKb for the butyrate ion.

Solved • Dec 13, 2018

Ka and Kb

Q. Given that the Ka for acetic acid is 1.8x10-5 and the Ka for hypochlorous acid is 3.0x10-8, which is the stronger base, the acetate ion or the hypo...

Solved • Dec 13, 2018

Ka and Kb

Q. Given that Kb for ammonia is 1.8x10-5 and that for hydroxylamine is 1.1x10-8, which is the stronger base?

Solved • Dec 13, 2018

Ka and Kb

Q. Given that Kb for ammonia is 1.8x10-5 and that for hydroxylamine is 1.1x10-8, calculate Ka value for NH4+.

Solved • Dec 13, 2018

Ka and Kb

Q. Given that Kb for ammonia is 1.8x10-5 and that for hydroxylamine is 1.1x10-8, calculate Ka value for H3NOH+.

Solved • Dec 13, 2018

Ka and Kb

Q. The average pH of normal arterial blood is 7.40. At normal body temperature (37oC), Kw=2.4 10-14.Calculate [H+] and [OH-] for blood at this tempera...

Solved • Dec 13, 2018

Ka and Kb

Q. Consider the given acid ionization constants. Identify the strongest conjugate base.Acid Ka HNO2(aq)4.6×10−4HCHO2(aq)1.8×10−4HClO(aq)2.9×10−8HCN(aq...

Solved • Dec 13, 2018

Ka and Kb

Q. The pH of a 1.00 M solution of urea, a weak organic base, is 7.050.Calculate the Ka of protonated urea.

Solved • Dec 13, 2018

Ka and Kb

Q. Like all equilibrium constants, the value of Kw depends on temperature. At body temperature (37oC), Kw = 2.4 x 10-14. What is the [H3O+] in pure wa...

Solved • Dec 13, 2018

Ka and Kb

Q. Write an equation for the autoionization of water and an expression for the ion product constant for water (Kw). What is the value of Kw at 25˚C?

Solved • Dec 13, 2018

Ka and Kb

Q. The following scene represent three weak acid HA (where A = X, Y, or Z) dissolved in water (H2O is not shown):(a) Rank the acids in order of increa...

Solved • Nov 21, 2018

Ka and Kb

Q. The autoionization constant for heavy water (deuterium oxide, D 2O) is 3.64×10−16 at 0°C and 7.89×10−15 at 50°C. Find [D 3O+] and pD of heavy water...

Solved • Nov 20, 2018

Ka and Kb

Q. If Kw = 1.139×10−15 at 0°C and 5.474×10−14 at 50°C, find [H3O+] and pH of water at 0°C and 50°C.

Solved • Nov 20, 2018

Ka and Kb

Q. (b) What is the pKa of the hydrazinium ion, H2N—NH3+ (Kb of hydrazine = 8.5 x 10−7)?

Solved • Nov 19, 2018

Ka and Kb

Q. (a) What is the pKb of ClO2−?

Solved • Nov 19, 2018

Ka and Kb

Q. What is the Ka of the 2-hydroxyethylammonium ion, HOCH2CH2NH3+ (pKb of HOCH2CH2NH2 = 4.49)?

Solved • Nov 19, 2018

Ka and Kb

Q. (a) What is the Kb of the acetate ion?

Solved • Nov 19, 2018

Ka and Kb

Q. Codeine (C18H21NO3) is a derivative of morphine that is used as an analgesic, narcotic, or antitussive. It was once commonly used in cough syrups b...

Solved • Nov 16, 2018

Ka and Kb

Q. Papaverine hydrochloride (abbreviated papH+Cl-; molar mass = 378.85 g/mol) is a drug that belongs to a group of medicines called vasodilators, whic...

Solved • Nov 16, 2018

Ka and Kb

Q. The Kb values for ammonia and methylamine are 1.8 X 10 -5 and 4.4 X 10 -4, respectively. Which is the stronger acid, NH4+ or CH3NH3+?

Solved • Nov 15, 2018

Ka and Kb

Q. Arrange the following 0.10 M solutions in order from most acidic to most basic. See Appendix 5 for Ka and Kb values.        CaBr 2, KNO2, HClO4, HN...

Solved • Nov 15, 2018

Ka and Kb

Q. At 40.ºC the value of Kw is 2.92 x 10 -14.c. If the hydroxide ion concentration in a solution is 0.10 M, what is the pH at 40.ºC?

Solved • Nov 7, 2018

Ka and Kb

Q. Values of Kw as a function of temperature are as follows:a. Is the autoionization of water exothermic or endothermic?

Solved • Nov 7, 2018

Ka and Kb

Q. Use Table 13‑2 to order the following from the strongest to the weakest acid.HClO2, H2O, NH4+, HClO4

Solved • Nov 7, 2018

Ka and Kb

Q. What is the ionization constant at 25 °C for the weak acid CH 3 NH3 +, the conjugate acid of the weak base CH3NH2, Kb = 4.4 × 10−4.

Solved • Nov 5, 2018

Ka and Kb

Q. The ionization constant for water (Kw) is 9.311 × 10−14 at 60 °C. Calculate [H3O+], [OH−], pH, and pOH for pure water at 60 °C.

Solved • Nov 5, 2018

Ka and Kb

Q. The ionization constant for water (Kw) is 2.9 × 10−14 at 40 °C. Calculate [H3O+], [OH−], pH, and pOH for pure water at 40 °C.

Solved • Nov 5, 2018

Ka and Kb

Q. Explain why a sample of pure water at 40 °C is neutral even though [H 3O+] = 1.7 × 10−7 M. Kw is 2.9 × 10−14 at 40 °C.

Solved • Nov 5, 2018

Ka and Kb

Q. Is the self ionization of water endothermic or exothermic? The ionization constant for water (Kw) is 2.9 × 10−14 at 40 °C and 9.3 × 10−14 at 60 °C.

Solved • Nov 5, 2018

Ka and Kb

Q. Complete the table below. Round each of your entries to 2 significant digits. You may assume the temperature is 25°C. 

Solved • Oct 23, 2018

Ka and Kb

Q. An acid with a low pKa: (a) is a weak acid (b) is a strong acid (c) has a weak conjugate base (d) both b and c  

Solved • Aug 23, 2018

Ka and Kb

Q. A monoprotic acid, HA, is dissolved in water HA ⇌ H+ + A- The equilibrium concentrations of the reactants and products are HA 0.150 M [H+] = 3.00 ×...

Solved • Aug 23, 2018

Ka and Kb

Q. Given that Ka for HCN is 6.2 x 10-10 at 25°C, what is the value of Kb for CN- at 25°C? Given that Kb for C6H5NH2 is 1.7 x 10-9 at 25°C, what is the...

Solved • Aug 21, 2018

Ka and Kb

Q. Given the following acids and Ka values: HClO4                  HOAc                     HCN                    HF 1 x 107                 1.76 x 1...

Solved • Aug 9, 2018

Ka and Kb

Q. At 25°C, what is the hydroxide ion concentration, [OH-], in an aqueous solution with a hydrogen ion concentration of [H+] = 2.4 x 10-9 M? 

Solved • Jul 25, 2018

Ka and Kb

Q. Complete the Kw expression for the autoionization of water.Kw = 1.00 x 10-14 =  

Solved • Jul 17, 2018

Ka and Kb

Q. What is the Ka reaction of HCN?The Ka of HCN is 6.2 x 10-10. What is the Kb, value for CN- at 25°C? Kb = 

Solved • Jul 16, 2018

Ka and Kb

Q. Which of the following organic compounds has the strongest conjugate base? 

Solved • Jun 19, 2018

Ka and Kb

Q. For the simple hydrides, MHn, pKa values decrease in the order: 

Solved • Jun 19, 2018

Ka and Kb

Q. What does it mean to say that water autoionizes? Water will cause many ionic compounds to dissociate without additional input of energy. Water is p...

Solved • Jun 4, 2018

Ka and Kb

Q. The Kb for a weak base is 6.7 times 10 -13. What will be the Ka for its conjugate acid? 

Solved • Jun 4, 2018

Ka and Kb

Q. Given that Ka for HF is 6.3 x 10 at 25 C, what is the value of Kb for F at 25°C?

Solved • May 21, 2018

Ka and Kb

Q. The Kw for water at 0°C is 0.12 x 10-14. Calculate the pH of a neutral aqueous solution at 0°C. ls a pH = 7.25 solution acidic, basic, or neutral a...

Solved • Apr 9, 2018

Ka and Kb

Q. What is the Kw of pure water at 50 degrees C, if the pH is 6.630?

Solved • Apr 5, 2018

Ka and Kb

Q. Complete the Kw expression for the autoionization of water.Kw = 1.00 x 10-14

Solved • Mar 26, 2018

Ka and Kb

Q. Given that Kb for (CH3)3N is 6.3 × 10-5 at 25°C, what is the value of Ka for (CH3)3NH+ at 25 °C?

Solved • Mar 23, 2018

Ka and Kb

Q. Given that Ka for HIO is 3.2 × 10-11 at 25°C, what is the value of Kb for IO– at 25°C?

Solved • Mar 23, 2018

Ka and Kb

Q. Given that Ka for HClO is 4.0 x 10-8 at 25°C, What is the value of Kb for ClO- at 25°C? Kb =____? 

Solved • Mar 23, 2018

Ka and Kb

Q. a. Given that Ka for HCN is 6.2x10-10 at 25°c, what is the value of Kb for CN- at 25°c?b. Given that Kb for NH3 is 1.8x10-5 at 25°c, what is the va...

Solved • Mar 22, 2018

Ka and Kb

Q. a. Given that Ka for HClO is 4.0 × 10-8 at 25°C, what is the value of Kb for ClO– at 25°C? b. Given that Kb for CH3CH2NH2 is 6.3 × 10-4 at 25°C, wh...

Solved • Mar 22, 2018

Ka and Kb

Q. The pKa of acetic acid, CH3COOH, is 4.76. What is the value of the equilibrium constant Keq, for the following equilibrium? The concentration of wa...

Solved • Mar 21, 2018

Ka and Kb

Q. The pKa of methanol (CH3OH) is 15.5 and the pKa of ammonia (NH3) is 36. Which is a stronger base CH3O- or NH2-? Briefly explain your answer.

Solved • Mar 21, 2018

Ka and Kb

Q. The Ka of HCN is 6.2 x 10 -10. What is the Kb value for CN - at 25°C

Solved • Mar 19, 2018

Ka and Kb

Q. Given the following acids and Ka values:  What is the order of increasing base strength?a. CN-, ClO4-, F-, OAC-b. ClO4-, OAC, CN-, F-c. CN-, F-, OA...

Solved • Mar 19, 2018

Ka and Kb

Q. a. What is the K a reaction of HCN? The Ka of HCN is 6.2 × 10-10.b. What is Kb value for CN– at 25°C?

Solved • Mar 14, 2018

Ka and Kb

Q. What is the Kb for C2H3O2- if the Ka for HC2H3O2 is 1.8 x 10-5?

Solved • Mar 13, 2018

Ka and Kb

Q. The Ka for HC2H3O2 is 1.8 x 10-5. What is the value of  Kb for C2H3O2-?

Solved • Feb 21, 2018

Ka and Kb

Q. The pKa of formic acid is 3.75. What is the K a of formic acid?

Solved • Feb 20, 2018

Ka and Kb

Q. Ka for HC2H3O2: 1.8 x 10 -5Ka for HCO3-: 4.3 x 10 -7Using the Ka's for HC2H3O2 and HCO3, calculate the Kb's for the C2H3O2- and CO32- ions.

Solved • Feb 19, 2018

Ka and Kb

Q. The Ka for HCN is 4.9 x 10-10. What is the value of  Kb for CN-?

Solved • Feb 15, 2018

Ka and Kb

Q. Rank these acids according to their expected p Ka values.

Solved • Jan 5, 2018

Ka and Kb

Q. What is the kb of water?

Solved • Jan 4, 2018

Ka and Kb

Q. The pka of acetic acid is 4.76 and the pka of trichloroacetic acid, which is used to remove warts, is 0.7. Calculate the dissociation constant of e...

Solved • Dec 19, 2017

Ka and Kb

Q. Which of the following bases is the STRONGEST? The base is followed by its K b. A) (CH3CH2)2NH, 8.6 × 10-4 B) CH3NH2, 4.4 × 10-4 C) C6H5NH2, 4.0...

Solved • Jun 16, 2017

Ka and Kb

Q. Calculate the value of Kb for the conjugate of the weak acid HNO 2.A. 4.6 x 10-4B. 4.2 x 1010C. 2.2 x 10-11D. 4.6 x 10-18E. 1.2 x 10-17

Solved • Apr 28, 2017

Ka and Kb

Q. Hydrofluoric acid, HF, is often used to etch glass. What is the value of K b for the fluoride ion, F-?A. 3.5 x 10-18B. 3.5 x 1010C. 1.0 x 10-14D. 7...

Solved • Apr 28, 2017

Ka and Kb

Q. Which of the following is the strongest base? A) CH3NH2 , Kb = 4.4 x 10-4 B) C5H5N, Kb = 1.7 x 10-9 C) H2NCONH2, Kb = 1.5 x 10-14 D) NH3, Kb = ...

Solved • Mar 23, 2017