Which chemical makes a basic sol'n? (MC)

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Discussion Overview

The discussion revolves around identifying which salts produce a basic solution when dissolved in water. Participants explore the dissociation of various salts and the implications for the resulting pH of the solution, focusing on concepts related to Bronsted-Lowry acids and bases.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested
  • Exploratory

Main Points Raised

  • One participant describes the dissociation of NaCl into Na(+) and Cl(-) and expresses uncertainty about the overall basicity of the solution.
  • Another participant notes that while Cl(-) is a Bronsted-Lowry base, it does not necessarily lead to a basic solution, using NaCl as an example.
  • A later reply emphasizes that a basic solution is characterized by a high pH and the presence of OH- ions, suggesting that the source of OH- must be considered.
  • There is a mention of the need to construct chemical equations to understand the products formed when the salts react with water.
  • One participant points out that Cl- is an extremely weak Bronsted-Lowry base.

Areas of Agreement / Disagreement

Participants do not reach a consensus on which salts produce a basic solution, and there are competing views regarding the role of specific ions and their contributions to the pH of the solution.

Contextual Notes

Participants highlight the importance of considering the products of dissociation and the generation of OH- ions when determining the basicity of a solution. There is an acknowledgment that some assumptions about the behavior of ions in solution may be missing or need further clarification.

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Homework Statement



Which of the following salts forms a basic solution when dissolved in water?
(A) NaCl
(B) (NH4)2SO4
(C) CuSO4
(D) K2CO3
(E) NH4NO3

2. The attempt at a solution

The way I understand, they would all dissociate like this:
NaCl(s) --> Na(+) + Cl(-)

I'm pretty sure the Cl(-) is a Bronsted base, or anything with a -ve charge, but as for the solution as a whole being basic, I'm not sure what they're asking...

Basically I'm screwed. Is this something you have to just know already?
Can anyone help me figure this out or refer me to a helpful resource?
 
Last edited:
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Jules18 said:

Homework Statement





2. The attempt at a solution

The way I understand, they would all dissociate like this:
NaCl(s) --> Na(+) + Cl(-)

I'm pretty sure the Cl(-) is a Bronsted base, or anything with a -ve charge, but as for the solution as a whole being basic, I'm not sure what they're asking...

Basically I'm screwed. Is this something you have to just know already?
Can anyone help me figure this out or refer me to a helpful resource?

http://en.wikipedia.org/wiki/Acids_and_bases

Does that help?
 
Construct chemical equations and react all the chemicals with H2O to see what they produce.

Just because a chemical is a Bronsted-Lowry base does not necessarily mean it produces a basic solution. For example, NaCl does not produce a basic solution, but Cl- is a Bronsted-Lowry base.
 
kldickson said:
Cl- is a Bronsted-Lowry base.

Extremally weak one, we should add.

--
 
So, the question is referring to the products and not the ions that react?
 
In a way... basic solution is the one with high pH, so OH- must be an important product. But you have to think about which ions in water will be a source of OH-.

--
 

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