answer is 3.70 What concentration ratio of acid to base, [CH3NH3*]/[CH3NH2], would be needed to make...
What ratio of CH3NH2 to CH3NH3* is needed to prepare a pH 10.00 buffer? (Kb for CH3NH2 is 4.4 % 10-4)
The weak base methylamine, CH3NH2, has Kb= 4.2x10^-4. CH3NH2 + H2O -> CH3NH3+ + OH- Calculate the equilibrium hydroxide ion concentration in a 0.95 M solution of the base. [OH-] = What are the pH and pOH of the solution?
A) CH3NH2 (methyl amine) is a weak base. Give the correct chemical equation for the aqueous base dissociation reaction. CH3NH2(aq) + H2O(l) ⇋ CH3NH3+ (aq) + HO−(aq) CH3NH2(aq) + H2O(l) ⇋ CH3NH3+ (aq) + H3O+(aq) CH3NH2(aq) + H3O+(aq) ⇋ CH3NH3+ (aq) + H2O−(l) CH3NH2(aq) + H2O(l) ⇋ CH3NH− (aq) + H3O+(aq) B) What concentration of ammonia is required to have a solution with a pH of 11.23? Kb = 1.8x10-5
Calculate the amounts in grams of weak acid and conjugate base needed to make the buffer. Buffers Concentration Volume Weak Acid Conjugate Base sodium acetate pH Ka acetic acid Buffer 1 500 mL 4.75
What is the ratio of base to acid needed to obtain a pH of 5.21 for buffer containing HCSHENCI and CsH5N? The K, of HCSHSN is 5.88x10-6 Multiple tries are permitted; however, 20% (1/5) point will be deducted for each incorrect response.
Design a buffer that has a pH of 9.76 using one of the weak base/conjugate acid systems shown below. Weak Base Kb Conjugate Acid Ka pKa CH3NH2 4.2 x 10-4 CH3NH3+ 2.4 x 10-11 10.62 C6H15O3N 5.9 x 10-7 C6H15O3NH+ 1.7 x 10-8 7.77 C5H5N 1.5 x 10-9 C5H5NH+ 6.7 x 10-6 5.17 How many grams of the chloride salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of...
What is the ratio of base to acid needed to obtain a pH of 4.02 for buffer containing HCNO and NaCNO? The Ka of HCNO is 2.0×10–4.
Determine the volume you would need of each solution (acid/base and conjugate) to make a buffer with a specific pH. Please only use the acids, bases and salts from the table on page 87 in the lab manual. See below for assigned values, each person will be calculating volumes needed for an acidic buffer and a basic buffer. Chart from page 87 List 0.10 M CH,NH, 9.75 the 0.10 M NHỰC H. " List E 0.10 M HCOOH K -...
Which one of the following species is amphiprotic? Select one: PO43–(aq) HCl(g) HSO4–(aq) Cl–(aq) For the system NH2OH + CH3NH3+⇌ CH3NH2 + NH3OH+ 95% 95 % 5 % 5 % the state of equilibrium in the system is described by the percentages given. Which of the species is the strongest base in the system? Select one: NH2OH CH3NH3+ CH3NH2 NH3OH+ An aqueous solution at 25.0 oC has an H3O+ concentration of 4.0 × 10–2 mol L–1. What is the OH–...
CH3NH2 is a weak base (Kb=5.0×10−4), so the salt CH3NH3NO3 acts as a weak acid. What is the pH of a solution that is 0.0680 M in CH3NH3NO3 at 25 ∘C?