How to find the pH of HCl and NaOH combined.

  • Thread starter Thread starter Sjm757
  • Start date Start date
  • Tags Tags
    Hcl Ph
Click For Summary

Discussion Overview

The discussion centers around calculating the pH of a solution resulting from the titration of hydrochloric acid (HCl) with sodium hydroxide (NaOH). Participants explore concepts related to pH, hydronium ion concentration, and the water ion product, addressing both theoretical and practical aspects of the problem.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant presents a homework problem involving the titration of HCl with NaOH and expresses confusion about calculating pH and related concentrations.
  • Another participant questions the understanding of hydronium ions, pH, and the water ion product, suggesting a need for foundational knowledge.
  • A different participant asserts that the water ion product applies to all solutions, indicating a broader applicability than initially suggested.
  • There is a contention regarding the definition of pH, with one participant stating that pH is not simply the negative logarithm of acid concentration, while another claims their teacher instructed them to use that method.
  • A later reply challenges the validity of the solution provided by the first participant, asking for clarification on the use of an incorrect definition of pH.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct definition of pH and its application in this context. There are competing views on how to approach the calculations and the foundational concepts involved.

Contextual Notes

Some participants express uncertainty about the definitions and calculations related to pH and hydronium concentration, indicating potential gaps in understanding that may affect the problem-solving process.

Sjm757
Messages
26
Reaction score
0

Homework Statement


I have .100mL of .100M HCl titrated with .100M NaOH, there's a chart I have to fill in and I'm completely lost. I have the volume of NaOH(from 0ml-200ml) I have to find the total volume of the solution, I get that, moles remaining of solution molarity of remaining solution the hydronium ion concentration the OH concentration and the pH


Homework Equations





The Attempt at a Solution


0.00mL of NaOH added, so the volume is .01L, the moles remaining would also be .01 because 100mL*.100M HCl, the pH is just -log.01 then, resulting in 2. I don't know how to get the Hydronium ion concentration or concentration of OH, any help is welcome.
 
Physics news on Phys.org
I read the water ion product, that would apply to solutions not diluted?
 
It applies to all solutions.

But you should start learning about hydronium and pH. In general pH is NOT minus log of the acid concentration (even if in some specific circumstances it can be calculated this way).
 
I talked to my teacher and he just wanted us to find the pH as the -log way. But I got it, thank you for the help
 
I don't see how you were able to solve the problem using incorrect pH definition. Can you elaborate?
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 22 ·
Replies
22
Views
7K
  • · Replies 3 ·
Replies
3
Views
6K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
4
Views
2K