Calculate the pH of a 0.20M NH3 / 0.20M M NH4Cl buffer after the addition of...

Question

Question

Calculate the pH of a 0.20M NH₃ / 0.20M M NH₄Cl buffer after the addition of 15.0 mL of 0.10 M HCl to 65.0 mL of the buffer. (K_b = 1.8 x 10^-5)

science chemistry

Answer 1

Answer #1

mmoles of NH3 = 65 x 0.20 = 13

mmoles of NH4Cl = 65 x 0.20 = 13

mmoles of HCl = 15 x 0.10 = 1.5

Kb = 1.8 x 10^-5

pKb = 4.74

pKa = 9.26

pH = pKa + log [base - C / acid + C]

= 9.26 + log [13 - 1.5 / 13 + 1.5]

pH = 9.16

Add a comment

Answer 2

Similar Homework Help Questions

Calculate the pH of a 0.20 M NH3/0.20 M NH4Cl buffer after the addition of 25.0...

Calculate the pH of a 0.20 M NH3/0.20 M NH4Cl buffer after the addition of 25.0 mL of 0.10 M HCl to 65.0 mL of the buffer.
a) Calculate the pH of a buffer that is 0.20 M NH3 and 0.20 M NH4Cl...

a) Calculate the pH of a buffer that is 0.20 M NH3 and 0.20 M NH4Cl Correct? b) Calculate the pH after addition of 10 mL 0.10 M HCl to 65 mL of the buffer? c) Calculate the pH after addition of 5 mL of 1.0 M LiOH to 200 mL of the buffer?
16.17. Calculate the ph of the nh3 0.20 m/nh4cl 0.20 M dampening system. What is the...

16.17. Calculate the ph of the nh3 0.20 m/nh4cl 0.20 M dampening system. What is the Ph of the buffer dissolution after adding 10.0 ml of HCl 0.10 M to 65.0 ml of the dampening system.

38. A buffer solution is 0.40 M NH3 and 0.60 M NHACI. Kb for NH3 is 1.8 x 10-5 a) Calculate the pH for the buffer sy...

38. A buffer solution is 0.40 M NH3 and 0.60 M NHACI. Kb for NH3 is 1.8 x 10-5 a) Calculate the pH for the buffer system. b) Calculate the pH of the solution after adding 0.00600 moles of NaOH to 400.0 mL of the buffer. c) Calculate the pH of the solution after adding 0.050 moles of HCl to 600.0 mL of the buffer.
What is the pH of a buffer formed from 50 mL of 15.0 M NH3 and...

What is the pH of a buffer formed from 50 mL of 15.0 M NH3 and 53.5 g of NH4Cl in enough water to make 500 mL of solution? (Kb = 1.8 x 10-5)
6. (a) Calculate the pH of the 0.39 M NH3/ 0.73 M NH4Cl buffer system. pH...

6. (a) Calculate the pH of the 0.39 M NH3/ 0.73 M NH4Cl buffer system. pH = (b) What is the pH after the addition of 20.0 mL of 0.075 M NaOH to 80.0 mL of the buffer solution? pH =

Calculate the pH of a buffer prepared by dissolving 0.10 mol of NH4Cl in 1.00 L...

Calculate the pH of a buffer prepared by dissolving 0.10 mol of NH4Cl in 1.00 L of 0.15 M NH3. Kb = 1.8 x 10 % for NH3. O a. 11.34 O b. 2.72 O ü O ö Oe. 4.56
a) Calculate the pH of a buffer system that contains o.200 M of NH3(aq) and o.200...

a) Calculate the pH of a buffer system that contains o.200 M of NH3(aq) and o.200 M of NH4Cl(aq). The Kb of NH3(aq) is 18 x 10-5. Consult Textbook Numerical Answer pH b) Calculate the change in pH when 6.00 mL of 100 M HCl is added to 100.0 mL of the buffer solution. Numerical Answer: c) Calculate the change in pH when 6.00 mL of o.100 M NaOH is added to 100.0 mL of the buffer solution. Numerical Answer:
Enter your answer in the provided box. Calculate the pH of a 0.20 M NH3/0.20 M...

Enter your answer in the provided box. Calculate the pH of a 0.20 M NH3/0.20 M NH4CI buffer after the addition of 25.0 mL of 0.10 M HCl to 65.0 mL of the buffer.

Kb for NH3 = 1.8 x 10–5 a) Calculate the pH of a buffer solution that...

Kb for NH3 = 1.8 x 10–5 a) Calculate the pH of a buffer solution that is 0.100 M NH3 and 0.120 M NH4NO3. b) What is the pH after 60.0 mL of 0.010 M HCl is added to 90.0 mL of the buffer solution in 2(a). Assume the change in volume is additive. c) What is the pH after 60.0 mL of 0.010 M Ca(OH)2 is added to 90.0 mL of the buffer solution in 2(a). Assume the change...