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Acid Base Practice Problems Quiz

March 23, 2019 By Leah4sci 34 Comments

Acid-n-Bases-practice-quizReady to test your knowledge of acids and bases with a few practice problems?

This quiz is designed to follow my Acids and Bases tutorial video series. But I'm  not looking to see if you simply ‘memorized' the concepts. The videos use simple examples to demonstrate concepts, these questions will test you at a slightly higher level.

So give it a shot, see how you do, then download the solutions at the end of the quiz.

Be sure to grab the Acid/Base Cheat Sheet to help you along.

Acid Base Practice Question 1

Which is the stronger acid?

Acid Base Practice Question 01

Acid Base Practice Question 2

Rank the following ionic compounds in order of increasing base strength.

Acid Base Practice Question 02

Acid Base Practice Question 3

Which of the following is the stronger base? (Not asking if it forms a stronger conjugate base)
Update: Although many organic textbooks state the pKa of water to be 15.7, the correct value for the pKa of water is 14.e

Acid Base Practice Question 03

Acid Base Practice Question 4

Which of the following is the stronger acid?

Acid Base Practice Question 04

Acid Base Practice Question 5

Which of the following forms a stronger acid upon reacting with a proton?

Acid Base Practice Question 05

Acid Base Practice Question 6

Rank the following in order of increasing base strength

Acid Base Practice Question 06

Acid Base Practice Question 7

Rank the following in order of increasing acidity.

Acid Base Practice Question 07

Acid Base Practice Question 8

Rank the following in order of increasing acidity.

Acid Base Practice Question 08

Acid Base Practice Question 9

Label the acid, base, conjugate acid and conjugate base in this reaction

Acid Base Practice Question 09

Hint: Not sure which is which? Watch Acid/base video 1 for a quick refresher

Acid Base Practice Question 10

Label the acid, base, conjugate acid and conjugate base in this reaction

Acid Base Practice Question 10

Hint: Not sure which is which? Watch Acid/base video 1 for a quick refresher

Acid Base Practice Question 11

Rank the following in order of decreasing acidity

Acid Base Practice Question 11

Acid Base Practice Question 12

Rank the following in order of increasing acidity

Acid Base Practice Question 12

Acid Base Practice Question 13

Complete this acid base reaction and determine the position of equilibrium

Acid Base Practice Question 13

Acid Base Practice Question 14

Complete this acid base reaction and determine the position of equilibrium

Acid Base Practice Question 14

Acid Base Practice Question 15

Which of the following forms a weaker conjugate base?

Acid Base Practice Question 15

Acid Base Practice Question 16

Which of the the labeled protons is more acidic, and why?

Acid Base Practice Question 16

Acid Base Practice Question 17

Rank the labeled protons in order of increasing acidity.

Acid Base Practice Question 17

Acid Base Practice Question 18

Which is the stronger acid?

Acid Base Practice Question 18

Acid Base Practice Question 19

Which is the stronger acid and why?

Acid Base Practice Question 19

Acid Base Practice Question 20

Which forms a weaker conjugate base and why?

Acid Base Practice Question 20

Acid Base Bonus Practice Question 1

Rank the following in order of increasing acidity. Use resonance to back up your explanation.

Acid Base Practice Bonus Question 1

Acid Base Bonus Practice Question 2

Which is the stronger acid and why?

Acid Base Practice Bonus Question 2

Ready to see how you did?

Don't just right to t he solutions. Instead challenge yourself to try every question first.
Send Me The Solutions!

Filed Under: Organic Chemistry Practice Problems Tagged With: quiz

Comments

  1. Jaye says

    September 22, 2018 at 10:47 am

    I believe the answer to Question 4 is incorrect. The answer key says “CH3OH > HF”, however since the Ka of HF is larger than the Ka of CH3OH, that would make HF a stronger acid. I believe that’s what the comments from 3 years ago were trying to address.

    Reply
  2. sameera says

    January 12, 2018 at 12:25 pm

    please can you tell me the link of the video in which you have explained the solution of bonus question 1

    Reply
  3. Akis says

    August 30, 2017 at 7:18 am

    I think that there’s a mistake in solutions of question 12 as m-nitrobenzoic acid is obviously more acidic than benzoic acid due to strong -I inductive effect of the nitrate group. I think you should check that.

    Reply
  4. sahar says

    July 23, 2017 at 1:19 pm

    Hello, I have a question about problem #4. In the solutions, it says CH3OH is a stronger acid than HF. However, the higher the Ka, the lower the pKa, and the stronger the acid. It shows that HF has a higher Ka than CH3OH so shouldn’t it be the stronger acid? Thank you.

    Reply
  5. Hai says

    May 24, 2017 at 5:55 am

    Hi! Thank you for the problems and solutions. Question 4 have me confused a bit. Larger Ka value means strong acid, but in your solution you wrote CH3OH > HF

    Reply
  6. mayu says

    January 23, 2017 at 11:57 pm

    I have not received pdf solutions.Also checked in spam .Can you please email me!!.Thank you!

    Reply
  7. Kristen Kraemer says

    January 9, 2017 at 5:00 pm

    Hi Leah:

    I’m confused by the answer to questions 14. The products (compounds to the right of arrow) are neutral whereas the reactants on the left side of the arrow are charged. Therefore, wouldn’t that supersede the resonance and electronegativity that stabilizes the charged reactants? I assumed the arrow would point to the right.

    Thank you!

    Reply
  8. Michael Fedorovsky says

    December 16, 2016 at 8:32 pm

    I think you should check out some of your solutions: in problem 12 I think the -OCH3 benzene would be the strongest base/weakest acid due to the electron donating tendencies of the -OCH3 group.

    Reply
  9. Sarah Wilson says

    October 1, 2016 at 5:02 pm

    I have an exam coming up and your videos as well as this quiz really helped me make sense of some concepts I have been having trouble with. Thank you!

    Reply
    • Leah4sci says

      October 19, 2016 at 12:51 pm

      You’re Welcome, Sarah!

      Reply
  10. ghulam mohiuddin says

    September 22, 2016 at 6:58 am

    I have done to write all problems so easily thanks lovely girl

    Reply
    • ghulam mohiuddin says

      September 22, 2016 at 7:00 am

      Plz send me your email id.

      Reply
  11. Christina says

    September 2, 2016 at 1:09 pm

    Hello!
    I have not received the PDF solutions for this quiz. I’m not sure if I am doing something wrong but I have tried numerous times.
    Please help!

    Reply
    • Leah4sci says

      December 29, 2016 at 5:55 pm

      Have you checked your spam folder? You may try a different email if it still doesn’t come through.

      Reply
  12. mina says

    June 24, 2016 at 9:46 pm

    please our professor gave us primary , secondary and tertiary amines and asked us to compare between them in an increasing acidity order

    Reply
    • Leah4sci says

      July 3, 2016 at 10:53 am

      Alkyl groups make amines more basic

      Reply
  13. Lakshita says

    May 24, 2016 at 2:49 pm

    Hello Liah I haven’t received any email for the solutions despite clicking on the link and giving required information. Can u mail it to me or give me ur email address?

    Reply
    • Leah4sci says

      May 26, 2016 at 10:58 am

      Lakshita: Email me

      Reply
  14. Marina says

    September 22, 2015 at 2:09 pm

    I can’t find the quiz solutions. Where are they?

    Reply
    • Leah4sci says

      September 24, 2015 at 5:50 pm

      They’re linked at the bottom of the page. Email me if you still can’t find it

      Reply
      • Sami says

        January 25, 2016 at 3:07 am

        Hey Leah, the email won’t send for the acid and base solutions of the quiz. If you can email it to me that would be great!

        Thanks!

        Reply
        • Leah4sci says

          January 26, 2016 at 12:19 am

          Email me

          Reply
  15. Mariam says

    September 13, 2015 at 6:13 pm

    i cant find the solutions to the quizzes

    Reply
    • Leah4sci says

      September 15, 2015 at 9:46 am

      Mariam: it’s linked at the bottom of the page

      Reply
  16. Chem Teacher says

    September 5, 2015 at 6:42 pm

    To everyone asking about the m-nitrobenzoic acid: m-nitrobenzoic acid is not a weaker acid than benzoic acid. This is an error in her solutions. m-Nitrobenzoic acid is a stronger acid than benzoic acid. The pKa of m-nitrobenzoic acid is 3.49 while that of benzoic acid is 4.20. This is due to the inductive effect of the electron withdrawing nitro group stabilizing the conjugate base.

    Reply
  17. Yasmin says

    June 17, 2015 at 6:07 pm

    Hello, I have a question on number 4.I understand how the higher the Ka, the lower the pKa, and so the stronger the acid. But, the Ka of HF is higher (^-4) than the Ka of CH3OH (^-16), meaning that the pKa of HF will come out larger than CH3OH and so becomes the stronger acid. But, the answer is CH3OH. May you explain this please, thank you.

    Reply
    • Leah4sci says

      June 21, 2015 at 12:49 am

      High Ka or lower pKa is the stronger acid making HF stronger

      Reply
      • Bilal Biriyani says

        December 9, 2018 at 1:13 pm

        On the solution document, I think there is a mistake on question 4. The HF should be the stronger acid, so the symbol should be flipped.

        Reply
  18. Ha Phuong says

    March 19, 2015 at 7:49 am

    Yes, i did but i stil confused. Because I think that Nitrogen (with the (+) charge) which can pull the electrons towards it, and make the conjugate base be more stable.

    Reply
    • Leah4sci says

      March 19, 2015 at 10:48 am

      That’s correct, so I guess I don’t understand your question

      Reply
      • Ha Phuong says

        March 21, 2015 at 7:23 am

        Because I saw on your quiz solution you said that m-nitrobenzoic acid is the weakest while we compare the acid strength among m-Nitrobenzoic acid, benzoic acid and m-methyl benzoate.

        Reply
  19. phuonh says

    March 15, 2015 at 8:23 am

    Can you explain to me. Why m-nitrobenzoic acid is weaker than benzoic acid. Thanks alot

    Reply
    • Leah4sci says

      March 16, 2015 at 10:23 am

      Did you check the quiz solutions?

      Reply
      • Afrah says

        July 24, 2017 at 2:33 am

        yes leah that one has me confused as well.

        Reply

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