Chem I: Determining Acidic, Basic or Neutral Salt

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Discussion Overview

The discussion focuses on predicting whether specific salts are acidic, basic, neutral, or undetermined. Participants analyze the properties of salts such as NaOCl, NH4I, Sr(ClO3)2, and KCN, exploring their behavior in aqueous solutions.

Discussion Character

  • Homework-related
  • Debate/contested
  • Exploratory

Main Points Raised

  • One participant suggests that NaOCl dissociates into Na+ and ClO-, proposing that Na+ could yield a strong acid HClO.
  • Another participant challenges this view, stating that ClO- is not derived from a strong acid and questions the initial claim about NaOCl.
  • For NH4I, a participant notes that NH4+ can release a proton to form NH3 and HI, indicating it is associated with a strong acid.
  • Regarding Sr(ClO3)2, one participant expresses uncertainty about its classification, suggesting it might be neutral but does not provide a clear rationale.
  • In the case of KCN, one participant posits that K+ comes from a strong base while CN- is from a weak acid, indicating a potential basic nature for the salt.
  • Another participant expresses confusion about the overall concepts and seeks additional resources for understanding acid-base chemistry.
  • A later reply emphasizes that textbooks contain valuable information on strong and weak acids and bases, suggesting that understanding the hydrolysis of weak acids and bases is crucial for determining the nature of salts.

Areas of Agreement / Disagreement

Participants express disagreement on the classification of NaOCl and KCN, with multiple competing views on their acidic or basic nature. The discussion remains unresolved regarding the classification of Sr(ClO3)2.

Contextual Notes

Participants demonstrate varying levels of understanding of acid-base chemistry, with some missing key assumptions about strong and weak acids and bases. There is a lack of consensus on the classification of certain salts, and the discussion reflects uncertainty in the reasoning process.

markelmarcel
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Homework Statement



Predict if the following salts are acidic, basic, neutral or undetermined.

Homework Equations



a. NaOCl

b. NH4I

c. Sr(ClO3)2

d. KCN


The Attempt at a Solution



A. NaClO = Na+ and ClO-
So, if Na+ gives up a proton, that would turn it into Na... and make ClO into HClO... and HClO is a strong acid.

B. NH4I = NH4+ and I-
So if NH4+ gives up a proton it turns into NH3 and HI... which is a strong acid.

C. Sr(ClO3)2 = Sr2+ and ClO3-
So if Sr gives away a proton it's left with Sr+ and ClO3 becomes neutral??

D. KCN = K+ and CN-
K can give up a proton and be K and make CN- have no charge... CN? Neutral?


I know that C is netural but I don't know why and I'm pretty sure I'm right on the two acids, but the last one I think is supposed to be basic, but I don't know how...
 
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You must be wrong about NaClO; One would imagine an anion with more oxygens could be for an acidic protonated form, but the ClO-1 is not from a strong acid. (Hypochlorite).

KCN ?
K+ from strong base, and CN- from weak acid.
 
symbolipoint said:
You must be wrong about NaClO; One would imagine an anion with more oxygens could be for an acidic protonated form, but the ClO-1 is not from a strong acid. (Hypochlorite).

KCN ?
K+ from strong base, and CN- from weak acid.


See... I don't understand how this works. Haha. I got one at least! My prof went through all this a little too fast for me. Any online resources to help me better understand this? (I like to be active with learning, not a whiner who just wants the answers)
 
Originally Posted by symbolipoint:
You must be wrong about NaClO; One would imagine an anion with more oxygens could be for an acidic protonated form, but the ClO-1 is not from a strong acid. (Hypochlorite).

KCN ?
K+ from strong base, and CN- from weak acid.


Reply from markelmarcel:
See... I don't understand how this works. Haha. I got one at least! My prof went through all this a little too fast for me. Any online resources to help me better understand this? (I like to be active with learning, not a whiner who just wants the answers)

You do not need internet resources. Your textbook should have plenty of instructive discussion on acid-base chemistry. You will learn which acids are strong and which bases are strong. The rest are nearly always weak acids or bases. The ion of a weak acid or base will tend to hydrolize to recombine with the acid or base from which it is part.

As example, let Ac stand for "acetate" anion. If NaAc is dissolved in water, the salt ions are present in solution as ions; but some portion of Ac will recombine with H+ by hydrolysis:
Ac- + HOH <--------> HAc + OH-

That will tend to make the solution alkaline.
 
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