Call Now to Set Up Tutoring:

(888) 888-0446

AP Chemistry : Reactions and Equilibrium

Study concepts, example questions & explanations for AP Chemistry

Create An Account

All AP Chemistry Resources

6 Diagnostic Tests 225 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1 : Using Base Dissociation Constant (Kb)

A 1M solution of a monoprotic acid has a pH of 4.6. What is the $\small K_{b}$ value for the conjugate base of the acid?

Possible Answers:

$\small 1.58*10^{-5}$

$\small 2.00*10^{-5}$

$\small 3.98*10^{-10}$

$\small 4.68*10^{-6}$

Correct answer:

$\small 1.58*10^{-5}$

Explanation:

In order to find the base dissociation constant for the conjugate base, we can start by finding the acid dissociation constant for the acid. Since a 1M solution of the acid has a pH of 4.6, we can find the proton concentration of the solution.

$pH=-\log[H^+]\rightarrow [H^+]=10^{-pH}$

$\small [H^{+}] = 10^{-4.6} = 2.51*10^{-5}$

Since the acid is monoprotic, we can set the following equilibrium expression equal to its acid dissociation constant.

$\small K_{a} = \frac{[H^{+}][A^{-}]}{[HA]}$

We can see that, since the acid is monoprotic, the concntration of protons will be equal to the concentration of the acid anion. The final concentration of the acid molecule will be equal to the initial concentration, minus the amount of protons formed. Using these values, we can solve for the equilibrium constant for the acid.

$K_a= \frac{[2.51*10^{-5}]^{2}}{[1-2.51*10^{-5}]} = 6.31*10^{-10}$

Now that we have the acid dissociation constant, we can find the conjugate base's dissociation constant by setting the product of the two values equal to the autoionization of water.

$\small K_{w} = K_{a}K_{b}$

$\small 1*10^{-14} = K_{b}(6.31*10^{-10})$

$\small K_{b} = 1.58*10^{-5}$

Report an Error

Example Question #24 : P H And Poh Of Strong Acids And Bases

Would H₂SO₄ or HNO₃ produce a more acidic solution?

Possible Answers:

HNO₃ since it has a lower pKa

H₂SO₄ since it has a higher pKa

HNO₃ since it has a higher pKa

H₂SO₄ since it has a lower pKa

Correct answer:

H₂SO₄ since it has a lower pKa

Explanation:

Both are strong acids, but H₂SO₄ is bivalent, realeasing 2 protons for each molecule dissolved in solution. Further, a more acidic solution would have a lower pKa.

Report an Error

Example Question #22 : P H And Poh Of Strong Acids And Bases

Which of the following species will not be present in an aqueous solution of H_2SO_4 ?

Possible Answers:

All of these will be present in the solution

H_3O^+

H^+

OH^-

H_2O

Correct answer:

OH^-

Explanation:

The hydroxide ion (OH–) is a strong base and therefore would not be present in an acidic solution. Protons, the hydronium ion, and water will all be present in relatively large amounts within the solution.

Report an Error

Example Question #26 : P H And Poh Of Strong Acids And Bases

Which of the following anions is the strongest base?

Possible Answers:

ClO_4^-

C_2H_3O_2^-

I^-

NO_3^-

Correct answer:

C_2H_3O_2^-

Explanation:

Weaker acids dissociate less in water and therefore, reverse reaction is favored in

$HX_{(aq)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O_{(aq)} + X^{-}_{(aq)}$ . This indicates that the weaker the acid, the stronger its conjugate base.

HI, HClO_4 , and HNO_3 are all strong acids. Their conjugates are weak bases.

C_2H_3O_2^- has the weakest conjugate acid among the all the choices, so it is the strongest base.

Report an Error

View AP Chemistry Tutors

Leonard
Certified Tutor

Florida State University, Bachelor of Science, Environmental Science.

View AP Chemistry Tutors

Janina
Certified Tutor

University of York (United Kingdom), Bachelor of Science, Chemistry. University of York (United Kingdom), Doctor of Philosoph...

View AP Chemistry Tutors

Joel
Certified Tutor

Georgia State University, Bachelor of Science, Biology, General.

All AP Chemistry Resources

6 Diagnostic Tests 225 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

ISEE Tutors in Los Angeles, English Tutors in Seattle, Reading Tutors in Washington DC, SSAT Tutors in San Diego, Statistics Tutors in Dallas Fort Worth, GMAT Tutors in Philadelphia, Reading Tutors in Atlanta, English Tutors in Washington DC, Statistics Tutors in San Diego, ACT Tutors in Philadelphia

Popular Courses & Classes

Spanish Courses & Classes in San Diego, GMAT Courses & Classes in New York City, SAT Courses & Classes in Philadelphia, SSAT Courses & Classes in Philadelphia, SAT Courses & Classes in Phoenix, SSAT Courses & Classes in Chicago, GMAT Courses & Classes in Phoenix, GRE Courses & Classes in Miami, SAT Courses & Classes in Atlanta, MCAT Courses & Classes in Denver

Popular Test Prep

GRE Test Prep in Atlanta, MCAT Test Prep in New York City, GMAT Test Prep in San Diego, GRE Test Prep in Philadelphia, LSAT Test Prep in Philadelphia, LSAT Test Prep in Houston, ACT Test Prep in Boston, SSAT Test Prep in Miami, GRE Test Prep in Denver, SSAT Test Prep in Washington DC

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

AP Chemistry : Reactions and Equilibrium

Study concepts, example questions & explanations for AP Chemistry

All AP Chemistry Resources

Example Questions

Example Question #1 : Using Base Dissociation Constant (Kb)

Example Question #24 : P H And Poh Of Strong Acids And Bases

Example Question #22 : P H And Poh Of Strong Acids And Bases

Example Question #26 : P H And Poh Of Strong Acids And Bases

All AP Chemistry Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: