Chemistry

State whether each of the following aqueous solutions would be acidic, basic, or neutral. Include appropriate net-ionic equations to show why a given solution is acidic or basic.

a) NaNO3
b)KC6H5CO2
c)50:50 mixture of C6H5CO2H+KC6H5CO2
d)(CH3NH3)Cl
e)50:50 mixture of CH3NH2+(CH3NH3)Cl
f)50:50 mixture of 0.1M NaBr +0.1M HBr

-How can you tell which substance receives the H+ or not? and which one is neutral?

  1. 👍 0
  2. 👎 0
  3. 👁 936
  1. The correct answer to your question is that you must recognize the kind of solution you have. Sometimes that is easier said than done, especially until you get some practice at it. Practice makes perfect.
    1. If it is a salt (a,b,d), the Bronsted-Lowry Theory tells you. In the case of NaNO3, neither Na+ nor NO3- is hydrolyzed; therefore, NaNO3 is neutral in water solution. For b (potassium benzoate), the benzoate ion is hydrolyzed, the K+ is not, so the benzoate takes the H+ and releases OH- and the solution is basic. (But see below for what I use.)
    2. For solution that are not salts but are mixtures, such as c, e, and f, use of the Henderson-Hasselbalch equation will tell you. (But see below to see how I do it.)

    Frankly, for salts, I use another approach. It will be frowned on by your teacher, I'm sure, but it works every time. For NaNO3,
    NaNO3 + HOH ==> NaOH + HNO3.
    The reaction actually does not take place BUT you can use it to answer the question of acidity or basicity. NaOH is a strong base. HNO3 is a strong acid. Therefore, the salt is neutral in water. What about KC6H5CO2?
    C6H5COOK + HOH ==> C6H5COOH + KOH
    C6H5COOH is a weak acid. You can find it listed in Ka tables. KOH is a strong base. In water, solution, the salt is basic (because of the strong base part). etc. I will leave d for you.

    For c, the H-H equation is
    pH = pKa + log (base/acid).
    pH = look up the value of Ka (and convert to pKa) or pKa C6H5COOH and substitute for pKa in the equation. Then substitute into the log part. A 50:50 mixture means base and acid or equal so base/acid = 1 and log 1 = 0; therefore, pH = pKa and you will know acid or base for the solution.
    Be sure to follow up if some of this is murky.
    What do I do for mixtures? If it is a mixture of weak acid and its salt the solution will be acidic. If it is a mixture of a weak base and its salt, the solution will be basic.

    1. 👍 0
    2. 👎 0
  2. Thank you so much!

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    Predict whether the following solutions are acidic, basic, or nearly neutral: a. NaBr, b. K2SO3, c. NH4NO2, d. Cr(NO3). the answer is neutral, basic, acidic, acidic and i am not sure why

  2. Chemistry

    Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral? Al(ClO4)3-Acid LiCl-Neutral KClO2-BAse C6H5NH3NO2-Acid CH3NH3Br-Acid KCl-Neutral NaClO-Base NH4ClO-Acid Fe(ClO4)3-Acid

  3. Integrated Science

    Judy tests a common household substance and finds that it has a pH of 7. What type of substance is in the scenario? A).basic B).acidic C).neutral D).salt I believe the answer is C). Is this correct?

  4. Integrated Science

    Zuzana tests a common household substance and finds that it has a pH of 3. What type of substance is in the scenari? A). basic B).salt C). neutral D). acidic I do believe the answer is D because any substance with a PH below 7 is

  1. chemistry

    will the following solutions be acidic, neutral, or basic? Write the net ionic equation for any reaction that takes place. NH4Cl, KHCO3, LiClO4, NH4NO3, H2CO3, LiClO2, Ba(NO3)2

  2. Chemistry

    Each value below represents a different aqueous solution at 25 °C. Classify each solution as acidic, basic, or neutral. pH=9.72 pOH=4.69 pOH=13.62 [H+]=7.5e-2 [H+]=7.8e-9 [H+]=1e-7 [OH-]=4.5e-12 [OH-]=3.5e-5 pH=4.09 pOH=7

  3. chemistry

    How do you know if these solutions are acidic, basic, or nearly neutral? a. NH4NO2 b. Cr(NO3)3

  4. AP chem

    This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are

  1. Chemistry

    Balance the equation in aqueous basic solution: NO2-(aq) + Al(s) → NH3(aq) + AlO2-(aq) I know how to balance equations in acidic solutions, but I get lost doing the basic one, please help?

  2. Chemistry

    Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral? Al(ClO4)3-Acid LiCl-Neutral KClO2-BAse C6H5NH3NO2-Acid CH3NH3Br-Acid KCl-Neutral NaClO-Base NH4ClO-Acid Fe(ClO4)3-Acid

  3. chemistry

    Hydrocyanic acid (HCN) is a much weaker acid than nitrous acid (HNO2). The pH values of 0.1 M solutions of the potassium salts of these two acids were determined separately. The statement which describes these determinations most

  4. Chemistry

    1. WHy is KHC8H4O4 used as the acid in standardization titration? 2. Why should you not shake KHC8H4O4 (Acidic solution) before titrating it with NaOH (Basic solution)? 3. Why is boiled distilled waster used to prepare acidic and

You can view more similar questions or ask a new question.