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Weak Bases Solutions Library

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160 solutions

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

Weak Bases

Q. A 0.100 M solution of ethylamine (C 2H5NH2) has a pH of 11.87. Calculate the K b for ethylamine.

Solved • Mar 26, 2018

Weak Bases

Q. a. NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.030M in NH4Cl at 25°C?b. ...

Solved • Mar 26, 2018

Weak Bases

Q. A certain weak base has a Kb of 8.60 × 10-7. What concentration of this base will produce a pH of 10.27?

Solved • Mar 23, 2018

Weak Bases

Q. Codeine C18H21NO3 is a weak organic base. A 5.0 x 10-3 M solution of codeine has a pH of 9.95. Calculate the value of Kb for this substance. What i...

Solved • Mar 23, 2018

Weak Bases

Q. If the Kb of a weak base is 6.2 × 10-6, what is the pH of a 0.39 M solution of this base?

Solved • Mar 23, 2018

Weak Bases

Q. Calculate the pH of a 0.234 M NaHCO3 solution. Look up the appropriate Ka or Kb value.

Solved • Mar 23, 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 • Mar 20, 2018

Weak Bases

Q. Amphetamine(C9H13N) is a weak base with a pK b of 4.2?Calculate the pH of a solution containing an amphetamine concentration of 205 mg/L.

Solved • Mar 6, 2018

Weak Bases

Q. Ka HNO2 = 7.1 x 10-4 and Pka HNO2 = 3.15a) Calculate the pH of 0.74 M KNO2.b) What is the concentration of HNO2 in the above solution?

Solved • Feb 16, 2018

Weak Bases

Q. Aniline, C6H5NH2, is a weak base that dissociates in water. At 25 °Celsius, the base dissociation constant, Kb , for aniline is 4.3 x 10 -10.(A) De...

Solved • Jan 5, 2018

Weak Bases

Q. The compound dimethylamine, (CH3)2NH, is a weak base when dissolved in water. Write the Kb expression for the weak base equilibrium that occurs in ...

Solved • Jan 4, 2018

Weak Bases

Q. Calculate the pH of a 0.30 M solution of sodium acetate (NaCH3COO) given that the Ka of acetic acid (CH3COOH) is 1.8 x 10 - 5.

Solved • Jan 3, 2018

Weak Bases

Q. Hydroxylamine, NH2OH, is a weak base. The following is the equilibrium equation for its reaction with water:NH2OH(aq) + H2O(l) ⇌ NH3OH+(aq) + OH - ...

Solved • Dec 22, 2017

Weak Bases

Q. Ammonia, NH3, is a weak base with a Kb value of 1.8 x 10 -5. What is the pH of a 0.390 M ammonia solution? What is the percent ionization of ammoni...

Solved • Dec 18, 2017

Weak Bases

Q. Sodium azide (NaN3) is sometimes added to water to kill bacteria. Calculate the concentration of all species in a 0.021 M solution of NaN3. The Ka ...

Solved • Dec 15, 2017

Weak Bases

Q. Calculate the pH and concentrations of CH3NH2 and CH3NH3+ in a 0.0279 M methylamine (CH3NH2) solution. The Kb of CH3NH2 = 4.47x 10 - 4.pH = ______(...

Solved • Dec 14, 2017

Weak Bases

Q. Answer the following questions. i) Calculate the pH of a 0.20 M solution of KCN.      ii) Calculate the pH of a 0.20 M solution of NH4Cl.

Solved • Sep 26, 2017

Weak Bases

Q. Calculate the pH of a 0.10 M solution of hydrazine, N2H4. Kb for hydrazine is 1.3×10−6.Express your answer numerically using two decimal places.

Solved • Sep 23, 2017

Weak Bases

Q. Calculate the pH of a 1.60 M KBrO solution. Ka for hypobromous acid, HBrO, is 2.0 × 10-9.

Solved • Jun 16, 2017

Weak Bases

Q. Determine the pH of a 0.188 M NH 3 solution at 25°C. The Kb of NH3 is 1.76 × 10-5. 

Solved • Jun 16, 2017

Weak Bases

Q. Find the [OH-] and pH of a 0.33 M methylamine (CH 3NH2) aqueous solution.Kb (CH3NH2) = 4.4 × 10-4.

Solved • May 30, 2017

Weak Bases

Q. Calculate the pH for a 0.20 M pyridine (C 5H5N) solution. Kb = 1.7 × 10-9

Solved • May 30, 2017

Weak Bases

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

Solved • May 30, 2017

Weak Bases

Q. Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Calculate the pH of a solution containing 455 mg/L of caffeine.

Solved • May 30, 2017

Weak Bases

Q. Calculate the percent ionization (protonation) of a 0.342 M solution of an unknown base. Kb = 1.9 x 10-5 for this base.A. 0.075 %B. 0.086 %C. 0.86 ...

Solved • Apr 28, 2017

Weak Bases

Q. Determine the pH of solution created by dissolving 0.748 grams of strychnine, C21H22N2O2, {MW = 334.45 g/mol) in 592 mL of solution.A. 4.08B. 8.17C...

Solved • Apr 28, 2017

Weak Bases

Q. Determine the pH of a 0.15 M aqueous solution of KF. For HF,  Ka = 7.0 × 10−4.A) 5.85            B) 12.01          C) 8.17            D) 6.68      ...

Solved • Mar 22, 2017

Weak Bases

Q. Determine the pH of a 0.35 M aqueous solution of CH 3NH 2 (methylamine). The K b of methylamine is 4.4 × 10 −4.     A) 13.24      B) 3.86      C) 1...

Solved • Mar 22, 2017

Weak Bases

Q. Calculate the [OH−] concentration in a 0.5 M solution of potassium fluoride (KF). Ka for HF is 7.2 × 10−4.1. 6.94 × 10−12 M2. 0.5 M3. 6.0 × 10−6 M4...

Solved • Mar 10, 2017

Weak Bases

Q. Determine the pH of a 0.15 M solution of NaBrO. K a (HBrO) = 2.8 * 10 -9A) 2.72B) 4.69C) 9.31D) 10.86E) 11.28

Solved • Oct 17, 2016

Weak Bases

Q. An unknown base, A-, with an initial concentration of 0.330 M has a percent ionization of 2.17%. What is the pH of the solution? 

Solved • Sep 22, 2016

Weak Bases

Q. An unknown weak base has an initial concentration of 0.23 M. What is the pH of the solution if the weak base also has a pKb of 5.18. 

Solved • Sep 22, 2016

Weak Bases

Q. When ammonium chloride is added to NH 3(aq),  1. the Kb increases. 2. the pH of the solution increases. 3. the pH of the solution decreases. 4....

Solved • Sep 21, 2016

Weak Bases

Q. The pH of 0.1 M C 4H9NH2(aq) (butylamine) aqueous solution was measured to be 12.04. What is the value of pKb of butylamine?1. 1.962. 2.933. 2.574....

Solved • Sep 21, 2016

Weak Bases

Q. Determine the pH of a 0.188 M NH 3 solution at 25°C. The Kb of NH3 is 1.76 x 10-5. A) 5.480 B) 2.740 C) 8.520 D) 11.260 E) 13.656

Solved • Aug 27, 2016

Weak Bases

Q. A beaker left on a lab bench contains 0.0926 M solution of an unknown weak base solution. Using a pH meter, a student measures the pH of this solut...

Solved • Aug 25, 2016

Weak Bases

Q. Calculate the pH of a 0.021 M NaCN solution.A. 3.18B. 8.51C. 5.94D. 10.82E. 12.32

Solved • Aug 25, 2016

Weak Bases

Q. What is the pH of a 0.593 M solution ethylamine, C 2H5NH2, solution?A. 1.74B. 3.48C. 10.52D. 12.26E. 13.77

Solved • Aug 25, 2016

Weak Bases

Q. Which of the following is the correct K b expression for the reaction below:B(aq) + H2O(l) ⇌ HB+(aq) + OH-(aq)A) Kb = [B][H2O]B) Kb = [HB+][OH-] / ...

Solved • Aug 25, 2016

Weak Bases

Q. What is the pH of a 0.050 M triethylamine, (C 2H5)3N, solution? Kb for triethylamine is 5.3 x 10–4.A) 11.69B) 8.68C) 5.32D) 2.31E) < 2.0

Solved • Aug 25, 2016

Weak Bases

Q. Calculate the pH of a 0.021 M NaCN solution. Ka of HCN = 4.9 x 10 -10 A) 1.68 B) 3.18 C) 5.49 D) 7.00 E) 10.82

Solved • Aug 25, 2016

Weak Bases

Q. What mass of sodium nitrite must be added to 350.0 mL of water to give a solution with pH = 8.40? Ka of HNO2 = 5.6 x 10 -4 A) 68 g B) 1.7 x 10-4 ...

Solved • Aug 25, 2016

Weak Bases

Q. What is the percent ionization of 0.50 M NH 3 (aq) solution? The Kb of NH3 is         1.8x10–5a) 0.50 %b) 0.60 %c) 0.70 %d) 0.80 %e) 0.90 %

Solved • May 16, 2016

Weak Bases

Q. Answer the following questions dealing with the weak base ammonia.  A. Ammonia, NH3, is incredibly soluble in water. Why? B. Calculate the molari...

Solved • Apr 18, 2016

Weak Bases

Q. What is the pH of a 0.23 M pyridine (C 5H5N) solution? The base dissociation constant of pyridine is 1.7 x 10 -9.

Solved • Mar 31, 2016

Weak Bases

Q. Determine the pH of a 0.22 M NaF solution at 25°C. The salt completely dissociates into Na + (aq) and F - (aq), and the Na + (aq) ion does not have...

Solved • Feb 24, 2016

Weak Bases

Q. A 0.80 M solution of an unknown base has pOH of 3.50. What is the pKb?  a) less than 1 b) 1.23 c) 7.10 d) 5.55 e) 6.90

Solved • Feb 23, 2016

Weak Bases

Q. Determine the pH of a 0.100 M solution of NaBrO where K a (HBrO) = 2.8 X 10  -9. A.  3.22      B.  4.78      C.  9.22      D. 10.78      E.  13.00

Solved • Feb 22, 2016

Weak Bases

Q. Given the concentration of a weak base solution and a K b value for the weak base, what is the correct procedure to determine the pH of the solutio...

Solved • Feb 22, 2016

Weak Bases

Q. Calculate the pH of 0.250 M LiF. The Ka of HF is 3.5 x 10  -4.

Solved • Feb 21, 2016

Weak Bases

Q. An unknown weak base has an initial concentration of 0.320 M with a pOH of 9.07. Calculate its equilibrium base constant. 

Solved • Feb 21, 2016

Weak Bases

Q. Calculate the pH of 0.030 M NaNO 2. The Ka of HNO2 is 4.6 x 10 -4.

Solved • Feb 21, 2016

Weak Bases

Q. Calculate the pH of 0.010 M sodium hypochlorite, NaClO, given that Ka = 3.0 x 10 -8 for hypochlorous acid, HClO. 

Solved • Feb 21, 2016

Weak Bases

Q. What is the pH of a 0.25 M solution of KCOOH? A. 0.60  B. 4.35 C. 5.43 D. 8.57 E. 9.65

Solved • Feb 21, 2016