The pKb for a generic amine(R-NH2)) in aqueous solution is 6.30. What is its pKa?
we have a relation between pKa and pKb
pKb + pKa = 14
pKa = 14 - pKb
pKa = 14 - 6.30
pKa = 7.70
The pKb for a generic amine(R-NH2)) in aqueous solution is 6.30. What is its pKa?
You have an acid with pKa=4.037. What is the pKb of its conjugate base? (pKa and pKb are unitless quantities)
Chapter 16 Relating pKa and pKb Review I Constants | Periodic Table Ar Learning Goal: To understand the relation between the strength of an acid or a base and its pKa and pKb values. The degree to which a weak acid dissociates in solution is given by its acid-ionization constant, Ka. For the generic weak acid, HA, HA(aq) A (aq) H (aq) and the acid-ionization constant is given by a HA Similarly, the degree to which a weak base reacts...
Consider a weak base that has a pKb of 4.2. • What is the pKa of this solution? • What is the pH of a 0.2 M solution of this base? • If you were to mix 50 mL of the 0.2 M base with 50 mL of a 0.1 M solution of its conjugate acid, what would the pH of this buffer be, and what is its effective buffering range?
Diethylamine ((C2H5)2NH) is a weak base. In aqueous solution at 25°C, it reacts with water to produce its conjugate acid, the diethylammonium ion ((C2H5)2NH2+), and the hydroxide ion (OH −). (a) If the base-dissociation constant (Kb) of diethylamine is 7.0 ✕ 10−4, calculate the acid-dissociation constant (Ka) for the conjugate acid. (b) What are the corresponding pKa and pKb values for this conjugate acid-base pair? pKa pKb
Consider an aqueous solution comprised of 0.150 M NH3 and 0.200 M NH4Cl. The pKb of NH3 is 4.75 and the volume of the solution is 1.00 L. a) What is the pH of this solution? Show your work. b) What is the chemical reaction (balanced chemical equation) that occurs when NaOH solution is added to the original solution? c) How many moles of NaOH(s) could this solution react with before its pH rises to 10.00? Show your work.
Consider two amines and identify which is the stronger base in aqueous solution. NH2 NH2 vs. Select the correct statement. Aniline is the stronger base in aqueous solution. They have equal strengths as bases in aqueous solution. O Cyclohexanamine is the stronger base in aqueous solution.
3) a) What is the pKb for a weak base if the pH of a 0.125M solution of this weak base was found to be 8.16? 4) When a weak acid is added to water to make a 0.250M solution, the acid was found to be 1.5% ionized. What is the Ka and pKa of this weak acid? 5) At 60°C, Kw = 9.6x10-14 (Kw increases as the temperature increases). a) For pure water at 60°C, what is the [H+] and pH....
What is the osmotic pressure (in atm) of a 1.36M aqueous solution of urea [(NH2)2CO] at 22.0 degree celsius.?
2. Consider an aqueous solution comprised of 0.200 M NH3 and 0.150 M NHACI. The pKb of NH3 is 4.75 and the volume of the solution is 1.00 L. a) (2 marks) What is the pH of this solution? Show your work. b) (1 mark) What is the chemical reaction (balanced chemical equation) that occurs when NaOH solution is added to the original solution? c) (3 marks) How many moles of NaOH(s) could this solution react with before its pH...
1. Calculate the concentration of H3O+ for an aqueous solution with a pH of 1.2 A) 6.3 x 10-7M B ) 1.6 x 108 M. C) 1.0 x 10-14 M. D) 6.20 x 10-2 M E) 4.0 x 10-4M 2. Calculate the concentration of OH- for an aqueous solution with a pH of 13.8. A) 0.64 M B) 4.0 x 10-5M C) 1.5 x 10-5M D) 1.0 x 10-14 M E) 2.5 x 10-10 M 3. Which of the following...