Question

A 30.0 mL sample of 0.05 M HCLO is titrated by 0.0250 M KOH solution. Ka...

A 30.0 mL sample of 0.05 M HCLO is titrated by 0.0250 M KOH solution. Ka for HCLO is 3.5 x 10-8. Calculate.....

a. the pH when no base has been added

b. the pH when 30.0 mL of the base has been added

c. the pH at the equivalence point

d. the pH when an additional 4.00 mL of the KOH solution has been added beyond the equivalence point

Homework Answers

Answer #1

millimoles of HClO = 30 x 0.05 = 1.5

pKa = - log Ka = - log [3.5 x 10-8] = 7.45

a) initially

pH = 1/2[pKa - logC]

pH = 1/2 [7.45 - log 0.05]

pH = 4.37

b) millimoles of KOH added = 30 x 0.025 = 0.75

1.5 - 0.75 = 0.75

means half way of equivalence point

at half way of equivalence point

pH = pKa

pH = 7.45

c) 1.75 millimoles KOH must be added to reach equivalence point

1.75 = V x 0.025

V = 70 mL KOH must be added

total volume = 70 + 30 = 100 mL

[NaClO] = 1.5 / 100 = 0.015 M

pH = 1/2 [pKw + pKa + logC]

pH = 1/2 [14 + 7.45 + log 0.015]

pH = 9.81

d) millimoles of KOH extra = 4 x 0.025 = 0.1

[KOH] = 0.1 / 104 = 0.00096 M

pOH = - log [OH-]

pOH = - log [0.00096]

pOH = 3.02

pH = 14 - 3.02

pH = 10.98

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 30.0 mL sample of 0.05 M HCLO is titrated by 0.0250 M KOH solution. Ka...
A 30.0 mL sample of 0.05 M HCLO is titrated by 0.0250 M KOH solution. Ka for HCLO is 3.5 x 10-8. Calculate the pH when no base has been added, the pH when 30.0 mL of the base has been added ,. the pH at the equivalence point and the pH when an additional 4.00 mL of the KOH solution has been added beyond the equivalence point
The sample of 30.00 mL of 0.015 M HClO is titrated with a 20.00 mL of...
The sample of 30.00 mL of 0.015 M HClO is titrated with a 20.00 mL of a 0.015 M NaOH solution. (a) Show the reaction between HClO and OH–. (1 point) (b) What is the final volume after two solutions were mixed? (1 point) (c) What is the final molarity of HClO after the reaction with OH–? (1 point) (d) What is the pH after 20.0 mL of the NaOH solution is added? (Ka of HClO is 3.0*10–8)   (1 point)
What is the pH when 30.0 mL of 0.10 M HCOOH solution is titrated with 10.0...
What is the pH when 30.0 mL of 0.10 M HCOOH solution is titrated with 10.0 mL of 0.20 M NaOH? (Ka=1.8 x 10−4) Which of the following titration curves would give the sharpest equivalence point? A 0.1 M HOBr with 0.1 M KOH B 0.1 M HOBr with 0.1 M NH3 C 0.1 M HBr with 0.1 M KOH D 0.1 M HBr with 0.1 M NH3
A  25.00-mL  sample of propionic acid,  HC3H5O2,  of unknown concentration A  25.00-mL  sample of propionic acid,  HC3H5O2,  of unknown concentration  was titrated w
A  25.00-mL  sample of propionic acid,  HC3H5O2,  of unknown concentration A  25.00-mL  sample of propionic acid,  HC3H5O2,  of unknown concentration  was titrated with  0.151  M  KOH. The equivalence point was reached when was titrated with  0.151  M  KOH. The equivalence point was reached when  41.28  mL  of base had been added. What is the pH at the equivalence point?    41.28  mL  of base had been added. What is the pH at the equivalence point?     Ka   for propionic acid is    1.3×10–5   at  25°C.Ka   for propionic acid is    1.3×10–5   at  25°C. Select one: a. 8.93 b. 7.65 c. 9.47 d. 5.98 e. 9.11
16.5 mL of 0.168 M diprotic acid (H2A) was titrated with 0.118 M KOH. The acid...
16.5 mL of 0.168 M diprotic acid (H2A) was titrated with 0.118 M KOH. The acid ionization constants for the acid are Ka1=5.2×10−5 and Ka2=3.4×10−10. At what added volume (mL) of base does the first equivalence point occur? 20.8 mL of 0.146 M diprotic acid (H2A) was titrated with 0.14 M KOH. The acid ionization constants for the acid are Ka1=5.2×10−5 and Ka2=3.4×10−10. At what added volume (mL) of base does the second equivalence point occur? Consider the titration of...
A 22.5 mL sample of an acetic acid solution is titrated with a 0.175M NaOH solution....
A 22.5 mL sample of an acetic acid solution is titrated with a 0.175M NaOH solution. The equivalence point is reached when 37.5 mL of the base is added. What was the concentration of acetic acid in the original (22.5mL) sample? What is the pH of the equivalence point? Ka acetic acid= 1.75E-5
The Ka for hypochlorous acid, HClO, is 3.0 x 10-8.Calculate the pH after 13.0 mL of...
The Ka for hypochlorous acid, HClO, is 3.0 x 10-8.Calculate the pH after 13.0 mL of 0.100 M NaOH have been added to 30.0 mL of 0.100 M HClO
A 100mL sample of.20 M HF is titrated with 0.10 M KOH. Determine the pH of...
A 100mL sample of.20 M HF is titrated with 0.10 M KOH. Determine the pH of the solution after the addition of 60.0 mL of KOH. Ka (HF) = 3.5*10^-4
A 1.54 gram sample of an unknown monoprotic acid is dissolved in 30.0 mL of water...
A 1.54 gram sample of an unknown monoprotic acid is dissolved in 30.0 mL of water and titrated with a a 0.225 M aqueous potassium hydroxide solution. It is observed that after 19.3 milliliters of potassium hydroxide have been added, the pH is 7.171 and that an additional 34.5 mL of the potassium hydroxide solution is required to reach the equivalence point. (1) What is the molecular weight of the acid?  g/mol (2) What is the value of Ka for the...
1. When a 19.6 mL sample of a 0.498 M aqueous acetic acid solution is titrated...
1. When a 19.6 mL sample of a 0.498 M aqueous acetic acid solution is titrated with a 0.343 M aqueous potassium hydroxide solution, what is the pH after 42.7 mL of potassium hydroxide have been added? pH= 2.What is the pH at the equivalence point in the titration of a 22.2 mL sample of a 0.413 M aqueous acetic acid solution with a 0.500 M aqueous potassium hydroxide solution? pH=
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT
Active Questions
  • 9. Children (approximately 11 years old) with cochlear implants (CI) and children with typical hearing (TH)...
    asked 3 weeks ago
  • The following selected account balances appeared on the financial statements of the Franklin Company. Use these...
    asked 3 minutes ago
  • 39. Carter Garcia is studying towards an online BS in Finance degree from George Washington University...
    asked 3 minutes ago
  • ___33. In the evolution of the vertebrates, the osteocytes are important in the formation of the:...
    asked 3 minutes ago
  • Flexible Budget for Selling and Administrative Expenses for a Service Company Cloud Productivity Inc. uses flexible...
    asked 4 minutes ago
  • Which of the following statements is/are incorrect? 1) A security's beta measures its market risk. 2)...
    asked 4 minutes ago
  • Describe the difference between acoustic impedance, specific acoustic impedance and characteristic acoustic impedance.
    asked 7 hours ago
  • Coyote Ugly LLC pays $100,000 to Roadrunner Development Company to acquire a 10-year lease with an...
    asked 8 minutes ago
  • An Astronomer needs to determine the volume of gas in a star. She makes several measurements...
    asked 8 minutes ago
  • Sales and Production Budgets Sonic Inc. manufactures two models of speakers, Rumble and Thunder. Based on...
    asked 14 minutes ago
  • During an ecology experiment, an aquarium half filled with water is placed on a scale. The...
    asked 14 minutes ago
  • The amount of time, in minutes, that a person must wait for a taxi is uniformly...
    asked 18 minutes ago