The pKa of the ammonium ion is 9.25. At what pH is ammonia 35 % ionized?

Question

Question

science chemistry

Answer 1

Answer #1

The fraction of un-ionized ammonia is given by

f = 1/(10^(pKa-pH) + 1)

0.65 = 1/[10^(9.25 - pH) + 1]

10^(9.25 - pH) + 1 = 1/0.65

pH = 9.52 answer

Add a comment

Answer 2

Similar Homework Help Questions

The pKa for the ammonium ion is 9.25. What is the pH of a solution that...

The pKa for the ammonium ion is 9.25. What is the pH of a solution that has an ammonia concentration of 0.133 M and an ammonium chloride concentration of 0.106 M?
Un-ionized ammonia (NH3) is toxic to fish at low concentrations. If the maximum allowable concentration of...

Un-ionized ammonia (NH3) is toxic to fish at low concentrations. If the maximum allowable concentration of NH3 in a river (CNH3) is 0.20 mg/L as N, what is the maximum concentration of ammonium ion (NH4+) allowed (CNH4+), in units of mg/L as N, when the river water pH is 9? The dissociation of ammonium ion in water has an equilibrium constant of pKa = 9.25 and is described by the reaction: NH4+ = NH3 + H+. Show units throughout the...
Ammonia (NH3) is somewhat volatile. It is also the conjugate base of the ammonium ion (NH4+)....

Ammonia (NH3) is somewhat volatile. It is also the conjugate base of the ammonium ion (NH4+). In order to keep the ammonia from volatilizing from a wastewater treatment reactor, it is useful to shift this acid-base equilibrium reaction toward NH4+. The pKa of the ammonium ion is 9.24. In what pH range should the reactor operate?

An ammonia buffer solution contains 0.24 M NH4+ and 0.21 M NH3. The pka of ammonium...

An ammonia buffer solution contains 0.24 M NH4+ and 0.21 M NH3. The pka of ammonium is 9.24. What is the pH of the buffer? Answer:
12. Identify which ammonium ion has the lower pka. (3 pts) ammonium ion has the lower pKa. Use aromaticity concepts to...

12. Identify which ammonium ion has the lower pka. (3 pts) ammonium ion has the lower pKa. Use aromaticity concepts to explain your answers. CH
2. What is the pH of buffer when 0.01 mol of NaOH is added to the...

2. What is the pH of buffer when 0.01 mol of NaOH is added to the 0.5L of ammonium buffer consisting of 0.3 M NH3 and 0.2 M NH4CI? (pKa of ammonia is 9.25.)

Ammonia exists in two forms, ammonium ion (NH4+) and ammonia gas (NH3). In solution, they are...

Ammonia exists in two forms, ammonium ion (NH4+) and ammonia gas (NH3). In solution, they are related by the reaction Nh4=H+NH3 pK=9.24 If the pH is 8.5 and the total ammonia concentration (ct) is 40 mg/L as N, calculate the concentration of dissolved ammonia gas (NH3) concentration id mg/L (Answer is 7.33 mg/L )
What is the pH of a solution containing 0.50 M ammonia and 0.50 M ammonium chloride?...

What is the pH of a solution containing 0.50 M ammonia and 0.50 M ammonium chloride? What will the pH be after 25mL of 0.20 M of hydrochloric acid has been added to 100.0mL of the solution containing the ammonia and ammonium chloride? What will the pH be after 18mL of 0.25 M of lithium hydroxide has been added to 100.0mL of the solution containing the ammonia and ammonium chloride? The ionization constant for ammonia is 1.8x10-5.
Nitrogen in a wastewater treatment plant is in the form of ammonia and ammonium ion and...

Nitrogen in a wastewater treatment plant is in the form of ammonia and ammonium ion and has a total ammonia concentration of 7.1 x 10^-4 M at pH = 7. Total ammonia concentration = [NH3] + [NH4^+]. NH3 partial pressure = 5 x 10^-10 atm. KH at 25-degree Celcius is 57 mol/(L x atm). Ka at 25-degree Celcius = 10^-9.26. A. Calculate NH3 and [NH4+] in M at the present condition where pH = 7 at 25 degrees Celcius. B....

What percentage of benzoic acid would be the ionized form at pH 5.00? (pKa of benzoic...

What percentage of benzoic acid would be the ionized form at pH 5.00? (pKa of benzoic acid is 4.2. (answer to two significant figures)