Chemistry Chemistry Practice Problems Solutions Library

Weak Bases Solutions Library

Access 154 Weak Bases video and text solutions to help you complete your homework. Need to revisit the concept? Watch our Weak Bases learn videos.

Browse Solutions

154 solutions

Weak Bases

Q. What is the pH of 0.10M diethylamine, (CH3CH2)2NH, (Kb=8.6x10-4)?

Solved • Mar 20, 2020

Weak Bases

Q. The pH of a 0.10 M solution of a weak base is 9.82. What is the Kb for this base?

Solved • Mar 20, 2020

Weak Bases

Q. Write the balanced equation for the ionization of the weak base pyridine, C5H5N, in water, H2O. Phases, such as (aq) or (l), are optional.

Solved • Mar 18, 2020

Weak Bases

Q. What is the pH of 0.65 M potassium formate, K[HCO2] aqueous solution? The Ka of formic acid, HCO2H, is 1.8 x 10-4.A. 1.9B. 2.0C. 7.0D. 8.8E. 10.4

Solved • Feb 10, 2020

Weak Bases

Q. What is the pH of 0.50 M C6H5NH2?       Kb = 3.8 x 10-10 for C6H5NH2A. 9.14B. 12.71C. 11.64D. 9.42E. 10.64

Solved • Feb 6, 2020

Weak Bases

Q. What is the pH of a 0.25 M solution of C 6H 5NH 2 given that its Kb is 1.8 x 10-6? a. 3.17b. 10.83c. 2.67d. 11.32

Solved • Dec 19, 2019

Weak Bases

Q. What is the pH of 0.688 M trimethylammonium iodide, (CH3)3NHI? Enter your answer with two decimal places. The Kb of trimethylamine, (CH3)3N, is 6.3...

Solved • Dec 18, 2019

Weak Bases

Q. Calculate the pH of a 0.30 M solution of sodium formate (NaHCOO) given that the Ka of formic acid (HCOOH) is 1.8 x 10-4.a. 2.13b. 11.87c. 8.61d. 7....

Solved • Dec 17, 2019

Weak Bases

Q. Calculate the pH of a 0.10 M solution of sodium formate (NaHCOO) given that the Ka of formic acid (HCOOH) is 1.8 x 10-4.a. 9.51b. 8.37c. 10.22d. 3....

Solved • Dec 17, 2019

Weak Bases

Q. Calculate the pH of a 0.30 M solution of ammonia (NH3, Kb = 1.8 x 10-5.)a. 11.37b. 10.57c. 8.88d. 3.43e. 2.63

Solved • Dec 17, 2019

Weak Bases

Q. Calculate the pH of a 0.40 M solution of sodium acetate (NaCH3COO) given that the Ka of acetic acid (CH3COOH) is 1.8 x 10-5.a. 10.39b. 8.22c. 9.17d...

Solved • Dec 12, 2019

Weak Bases

Q. Calculate the pH of a 0.20 M solution of sodium benzoate (NaC6H5COO) given that the Ka of benzoic acid (C6H5COOH) is 6.50 x 10-5.

Solved • Dec 12, 2019

Weak Bases

Q. Calculate the pH of a 0.10 M solution of sodium formate (NaHCOO) given that the Ka of formic acid (HCOOH) is 1.8 x 10-4.

Solved • Dec 12, 2019

Weak Bases

Q. Calculate the pH of a 0.30 M solution of aniline(C6H5NH2 , Kb = 3.8 x 10-10.)

Solved • Dec 12, 2019

Weak Bases

Q. Codeine (Cod), a drug used in pain killers and cough medicine, is a naturally occurring amine that has a Kb = 1.6 ×10–6. What is the pH of a 0.0012...

Solved • Nov 12, 2019

Weak Bases

Q. What is the pH of a solution in which 0.250 mol of NH3 (Kb = 1.8 × 10-5) is dissolved in sufficient water to make 1.00 L of solution?a. 2.67b. 11.3...

Solved • Nov 12, 2019

Weak Bases

Q. Determine the pH of a 0.227 M C5H5N solution at 25.0°C. The Kb of C5H5N is 1.7 x 10-9.

Solved • Jul 10, 2019

Weak Bases

Q. Solve an equilibrium problem (using an ICE table) to calculate the pH of each of the following solutions. (Ka(HF)=6.8 x 10-4)0.14 M NaF

Solved • Jan 3, 2019

Weak Bases

Q. What is the pH of a 0.65 M solution of pyridine, C5H5N? (The Kb value for pyridine is 1.7 x 10-9)

Solved • Dec 13, 2018

Weak Bases

Q. Order the following solutions from lowest to highest pH:0.10 M NaClO0.10 M KBr0.10 M NH4ClO4

Solved • Dec 13, 2018

Weak Bases

Q. Cocaine is a weak organic base whose molecular formula is C17H21NO4. An aqueous solution of cocaine was found to have a pH of 8.53 and an osmotic p...

Solved • Dec 13, 2018

Weak Bases

Q. Butyric acid is responsible for the foul smell of rancid butter. The pKa of butyric acid is 4.84.Calculate the pH of a 5.0×10−2 M solution of sodiu...

Solved • Dec 13, 2018

Weak Bases

Q. Determine the pOH of a solution that is 0.135 M in CO32 - .

Solved • Dec 13, 2018

Weak Bases

Q. A solution of 0.23 mol of the chloride salt of protonated quinine (QH+), a weak organic base, in 1.0 L of solution has pH=4.58.Find the Kb of quini...

Solved • Dec 13, 2018

Weak Bases

Q. Determine the pH of each of the following two-component solutions.0.120 M NaClO and 5.50×10−2 M KI

Solved • Dec 13, 2018

Weak Bases

Q. Determine the pH of each of the following solutions.0.21 M KCHO2

Solved • Dec 13, 2018

Weak Bases

Q. A 0.140 M solution of a weak base has a pH of 11.25.Determine Kb for the base.

Solved • Dec 13, 2018

Weak Bases

Q. Write equations showing how each of the following weak bases ionizes water to form OH–. Write the corresponding expression for Kb.HCO3–

Solved • Dec 13, 2018

Weak Bases

Q. Determine pH of a 0.18 M ammonia solution.

Solved • Dec 13, 2018

Weak Bases

Q. Morphine is a weak base. A 0.150 M solution of morphine has a pH of 10.5.What is Kb for morphine?

Solved • Dec 13, 2018

Weak Bases

Q. Sodium stearate (C17H35COONa) is a major component of bar soap. The K a of the stearic acid is 1.3×10−5. What is the pH of 10.0 mL of a solution co...

Solved • Nov 20, 2018

Weak Bases

Q. Acetic acid has a Ka of 1.8×10−5, and ammonia has a K b of 1.8×10−5. Find [H3O+], [OH−], pH, and pOH for 0.240 M acetic acid

Solved • Nov 20, 2018

Weak Bases

Q. Codeine (C18H21NO3) is a narcotic pain reliever that forms a salt with HCl. What is the pH of 0.050 M codeine hydrochloride (pKb of codeine = 5.80)?

Solved • Nov 19, 2018

Weak Bases

Q. (a) What is the pH of 0.75 M NaF?

Solved • Nov 19, 2018

Weak Bases

Q. (a) What is the pH of 0.65 M potassium formate, HCOOK?

Solved • Nov 19, 2018

Weak Bases

Q. (a) What is the pH of 0.100 M sodium phenolate, C 6H5ONa, the sodium salt of phenol?

Solved • Nov 19, 2018

Weak Bases

Q. (a) What is the pKb of NO2−?

Solved • Nov 19, 2018

Weak Bases

Q. (a) What is the pKb of ClO2−?

Solved • Nov 19, 2018

Weak Bases

Q. (a) What is the Kb of the benzoate ion, C6H5COO−?

Solved • Nov 19, 2018

Weak Bases

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

Solved • Nov 19, 2018

Weak Bases

Q. What is the pH of 0.26 M aniline?

Solved • Nov 19, 2018

Weak Bases

Q. What is the pH of 0.25 M ethanolamine?

Solved • Nov 19, 2018

Weak Bases

Q. What is the pH of 0.12 M diethylamine?

Solved • Nov 19, 2018

Weak Bases

Q. What is the pH of 0.070 M dimethylamine?

Solved • Nov 19, 2018

Weak Bases

Q. Write balanced equation and Kb expression for this Brønsted-Lowry base in water:(b) Acetylide ion, HC≡C−

Solved • Nov 19, 2018

Weak Bases

Q. Calculate the pH of the following solution:b. 0.84 M C6H5NH3NO3 (Kb for C6H5NH2 = 3.8 X 10 -10)

Solved • Nov 19, 2018

Weak Bases

Q. Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine, pK b1 = 5.1 and pK...

Solved • Nov 16, 2018

Weak Bases

Q. A 0.20-M sodium chlorobenzoate (NaC 7H4ClO2) solution has a pH of 8.65. Calculate the pH of a 0.20-M chlorobenzoic acid (HC7H4ClO2) solution.

Solved • Nov 16, 2018

Weak Bases

Q. Consider a solution of an unknown salt having the general formula BHCl, where B is one of the weak bases in the following table. A 0.10-M solution ...

Solved • Nov 16, 2018

Weak Bases

Q. An unknown salt is either NaCN, NaC2H3O2, NaF, NaCl, or NaOCl. When 0.100 mole of the salt is dissolved in 1.00 L of solution, the pH of the soluti...

Solved • Nov 16, 2018

Weak Bases

Q. Calculate the pH of the following solution.a. 0.12 M KNO2

Solved • Nov 16, 2018

Weak Bases

Q. Calculate the pH of the following solution.a. 0.10 M CH3NH3Cl

Solved • Nov 16, 2018

Weak Bases

Q. Calculate the concentrations of all species present in a 0.25-M solution of ethylammonium chloride (C2H5NH3Cl).

Solved • Nov 16, 2018

Weak Bases

Q. Determine [OH-], [H+], and the pH of the following solution.a. 1.0 M KCl

Solved • Nov 16, 2018

Weak Bases

Q. Calculate the mass of HONH 2 required to dissolve in enough water to make 250.0 mL of solution having a pH of 10.00 (Kb = 1.1 X 10 -8).

Solved • Nov 15, 2018

Weak Bases

Q. The pH of a 0.016-M aqueous solution of p-toluidine (CH 3C6H4NH2) is 8.60. Calculate Kb.

Solved • Nov 15, 2018

Weak Bases

Q. Calculate the pH of a 0.050-M (C 2H5)2NH solution (Kb = 1.3 X 10 -3).

Solved • Nov 15, 2018

Weak Bases

Q. Calculate the pH of a 0.20-M C 2H5NH2 solution (Kb = 5.6 X 10 -4).

Solved • Nov 15, 2018

Weak Bases

Q. Calculate [OH-], [H+], and the pH of 0.40 M solution of the following amine (the K  b values are found in the following table).a. aniline

Solved • Nov 15, 2018

Weak Bases

Q. Calculate [OH-], [H+], and the pH of 0.20 M solution of the following amine.b. hydroxylamine (HONH2, Kb = 1.1 X 10 -8)

Solved • Nov 15, 2018

Weak Bases

Q. Calculate [OH-], [H+], and the pH of 0.20 M solution of the following amine.a. triethylamine [(C2H5)3N, Kb = 4.0 X 10 -4]

Solved • Nov 15, 2018

Weak Bases

Q. For the reaction of hydrazine (N 2H4) in water, H2NNH2 (aq) + H2O(l) ⇌ H2NNH3+(aq) + OH -(aq)Kb is 3.0 X 10-6. Calculate the concentrations of all ...

Solved • Nov 15, 2018

Weak Bases

Q. What are the major species present in a 0.150-M NH 3 solution? Calculate the [OH -] and the pH of this solution.

Solved • Nov 15, 2018

Weak Bases

Q. Write the reaction and the corresponding K b equilibrium expression for the following substance acting as base in water.b. C5H5N

Solved • Nov 15, 2018

Weak Bases

Q. Calculate the pH of each of the following solutions.b. 0.100 M HONH3Cl

Solved • Nov 7, 2018

Weak Bases

Q. Novocaine, C13H21O2N2Cl, is the salt of the base procaine and hydrochloric acid. The ionization constant for procaine is 7 × 10−6. Is a solution of...

Solved • Nov 6, 2018

Weak Bases

Q. The pH of a solution of household ammonia, a 0.950 M solution of NH 3, is 11.612. Determine Kb for NH3 from these data.

Solved • Nov 6, 2018

Weak Bases

Q. Nicotine, C10H14N2, is a base that will accept two protons (K1 = 7 × 10−7, K2 = 1.4 × 10−11). What is the concentration of each species present in ...

Solved • Nov 6, 2018

Weak Bases

Q. Even though both NH3 and C6H5NH2 are weak base, NH3 is a much stronger acid than C6H5NH2. Which of the following is correct at equilibrium for a so...

Solved • Nov 6, 2018

Weak Bases

Q. Determine Kb for the nitrite ion, NO 2−. In a 0.10-M solution this base is 0.0015% ionized.

Solved • Nov 6, 2018

Weak Bases

Q. What is the effect on the concentration of NO 2 −, HNO2, and OH− when the following is added to a solution of KNO2 in water? The equation for the e...

Solved • Nov 5, 2018

Weak Bases

Q. A solution of 0.4270 M base B(aq) was prepared and the pH measured as 11.14. Calculate the pKb for the base. Enter the pKb with 2 decimal places.

Solved • Oct 5, 2018

Weak Bases

Q. Using data from Appendix D in the textbook, calculate [OH-] and pH for each of the following solutions. Part A 7.0 x 10-2 M NaCN. Express your answ...

Solved • Sep 18, 2018

Weak Bases

Q. A certain weak base has a Kb of 8.60 x 10-7. What concentration of this base will produce a pH of 10.14?

Solved • Sep 12, 2018

Weak Bases

Q. The base protonation constant Kb of ammonia (NH3) is 1.8 x 10-5. Calculate the pH of a 0.77 M solution of ammonia at 25°C. Round your answer to 1 d...

Solved • Sep 5, 2018

Weak Bases

Q. Calculate the pH of a solution prepared by mixing 0.000125 moles of HCOO- (Ka = 1.7 x 10-4) in 150.0 mL of water.

Solved • Sep 3, 2018

Weak Bases

Q. Calculate the concentrations of all species in a 0.700 M NaCH3COO (sodium acetate) solution. The ionization constant for acetic acid is K, = 1.8 x ...

Solved • Aug 29, 2018

Weak Bases

Q. What is the pH of a 0.470 M solution of methylamine (CH2NH2. Kb = 4.4 x 10-4)?

Solved • Aug 21, 2018

Weak Bases

Q. Morphine is an effective pain killer but is also highly addictive. Calculate the pH of a 0.105 M solution of morphine if its pKb = 5.79.

Solved • Aug 21, 2018

Weak Bases

Q. If the Kb of a weak base is 6.0 x 10-6, what is the pH of a 0.44 M solution of this base?

Solved • Aug 21, 2018

Weak Bases

Q. A certain weak base has a Kb of 7. 10 x 10. What concentration of this base will produce a pH of 10.30?

Solved • Aug 21, 2018

Weak Bases

Q. If the Kb of a weak base is 6.8 x 10-6, what is the pH of a 0.20 M solution of this base? pH = 

Solved • Aug 14, 2018

Weak Bases

Q. A certain weak base has a Kb of 8. 40 x 10-7, What concentration of this base will produce a pH of 10.21? 

Solved • Aug 14, 2018

Weak Bases

Q. Calculate the pH and concentrations of CH3NH2 and CH3NH3+ in a 0.0343 M methylamine (CH3NH2) solution. The Kb of CH3NH2 = 4.47 x 10-4. pH= [CH3NH2]...

Solved • Aug 14, 2018

Weak Bases

Q. If the Kb of a weak base is 5.4 x 10-6, what is the pH of a 0.50 M solution of this base?

Solved • Aug 7, 2018

Weak Bases

Q. A student makes a 0.444 M solution of a weak base (B:) that has a pH of 8.94. Determine the Kb, for this base. 

Solved • Aug 7, 2018

Weak Bases

Q. Part ACalculate the molar concentration of OH- ions in a 7.6 x 10-2 M solution of ethylamine (C2H5NH2) (Kb = 6.4 x 10-4). Express your answer using...

Solved • Jul 24, 2018

Weak Bases

Q. If the Kb of a weak base is 35 x 10 -6, what is the pH of a 0.26 M solution of this base?

Solved • Jul 9, 2018

Weak Bases

Q. A certain weak base has a Kb of 8.40 x 10 -r. concentration of this base will produce a pH of 10.05?

Solved • Jul 9, 2018

Weak Bases

Q. Calculate the pH of 0.024 M ammonia. NH3 (aq) + H2O (l) <->  OH - (aq) + NH4+(aq)     K b = 1.75 x 10 -5 

Solved • Jul 3, 2018

Weak Bases

Q. Ammonia, HN3, has a Kb = 1.8 x 10 -5. What is the pH of solution that of ammonia with a concentration of 0.450 M? 

Solved • Jun 25, 2018

Weak Bases

Q. What is the pH of a 0.94 M solution of the weak base pyridine (C  5H5N Kb = 1.7 x 10 -9)?

Solved • Jun 4, 2018

Weak Bases

Q. If the Kb of a weak base is 1.7 x 10 -6, what is the pH of a 0.25 M solution of this base?

Solved • May 29, 2018

Weak Bases

Q. The base protonation constant Kb of ammonia (NH3) is 1.8 x 10 -5. Calculate the pH of a 0.95 M solution of ammonia at 25 °C. Round your answer to 1...

Solved • May 12, 2018

Weak Bases

Q. Determine the pH of each of the following solutions. 0.16 M NaC2H3O2. Express your answer to two decimal places.

Solved • Apr 24, 2018

Weak Bases

Q. A 0.100 M solution of ethylamine (C2H5NH2) has a pH of 11.87. Calculate the Kb for ethylamine.

Solved • Apr 3, 2018

Weak Bases

Q. A 25.0-mL sample of 0.125 M pyridine is titrated with 0.100 MHCl. Calculate the pH at 0 mL of added acid. Express your answer using two decimal pla...

Solved • Mar 30, 2018

Weak Bases

Q. Find the pH of a 0.250 M solution of NaC2H3O2. (The Ka value of HC2H3O2 is 1.80×10-5).

Solved • Mar 27, 2018

Weak Bases

Q. Determine the pH of a 0.22M NaF solution at 25°C. The K a of HF is 3.5 x 10 -5.a. 10.20b. 5.10c. 8.90d. 11.44e. 2.56

Solved • Mar 27, 2018

Weak Bases

Q. Ammonia, NH3, is a weak base with a K b value of 1.8 x 10 -5.a. What is the pH of a 0.450 M ammonia solution? Express your answer numerically to tw...

Solved • Mar 26, 2018