Converting N to Moles in Acid-Base Chemistry

  • Context: Chemistry 
  • Thread starter Thread starter lha08
  • Start date Start date
  • Tags Tags
    Convert Moles
Click For Summary

Discussion Overview

The discussion revolves around converting normality (N) to moles in the context of acid-base chemistry, specifically regarding a problem involving the addition of NaOH to a buffer solution and its effect on pH. Participants explore the definitions and calculations related to normality and equivalents.

Discussion Character

  • Homework-related, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks clarification on converting 1 ml of 10 N NaOH into moles, expressing confusion about the meaning of 'N' and its relation to Avogadro's number.
  • Another participant confirms that 'N' stands for normality.
  • A participant attempts to calculate the equivalents from normality, suggesting that 10 equivalent/L multiplied by 0.01 L equals 0.1 equivalent, but questions the meaning of this result.
  • A later reply introduces a discussion about the definition of equivalents, noting that it can vary based on the reaction and providing examples of how different substances can have different normalities depending on their stoichiometry.

Areas of Agreement / Disagreement

Participants generally agree on the definition of normality, but there is no consensus on the interpretation of equivalents and how to apply it in the context of the problem.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the definitions of normality and equivalents, as well as the specific stoichiometry of the reactions involved.

lha08
Messages
158
Reaction score
0

Homework Statement


So I'm trying to solve a problem and it asks: If 1 ml of 10 N NaOH is added to a liter of the buffer prepared, how much will the pH change?
I know how to solve the problem but one thing is really confusing me, how am I able to convert the 1 ml of 10 N NaOH into moles...like what exactly does 'N' signify...? like supposedly it means avagadro's number. The answer to the number of moles is...0.01 mol OH


Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
Borek said:
N stands for normality.

Like it says that normality is equivalent/L...but like how am i supposed to get the NaOH in moles?...Do i calculate it as (10 equivalent/L)*(0.01 L)= 0.1 equivalent...but like what does this mean...?
 
Have you heard about google? Wikipedia?

http://en.wikipedia.org/wiki/Equivalent_(chemistry )

Note that wikipedia uses a narrow definition, that is - equivalents are what reacts with 1 mole of H+ or electrons. I prefer other definition - one that takes into account stoichiometry of the given reaction. Hence 1M HCl is always 1N, regardless of the reaction, while 1M H[su]2[/sub]SO4 is sometimes 1N and sometimes 2N, depending on the reaction.
 
Last edited by a moderator:

Similar threads

  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 12 ·
Replies
12
Views
3K
Replies
7
Views
5K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K