Calculating Concentrations in a 1.0-L Buffer Solution with Added HCl

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Discussion Overview

The discussion revolves around calculating the concentrations of components in a 1.0-L buffer solution after the addition of HCl. Participants explore the implications of the buffer composition and the effects of the added acid on the concentrations of HNO2 and NaNO3.

Discussion Character

  • Homework-related, Technical explanation, Debate/contested

Main Points Raised

  • One participant presents a calculation of the moles of HCl added and attempts to adjust the concentrations of HNO2 and NaNO3 accordingly.
  • Another participant argues that the HNO2/NaNO3 mixture does not constitute a proper buffer solution.
  • A different participant suggests that the correct sodium salt should be NaNO2 instead of NaNO3.
  • One participant critiques the mathematical execution of the calculations, indicating that the approach is conceptually sound but poorly executed.
  • A later reply claims to have arrived at the correct answers after receiving assistance.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the buffer composition, with some asserting it is not a valid buffer and others focusing on the calculations. The discussion remains unresolved regarding the correct interpretation of the buffer components.

Contextual Notes

There are potential limitations in the assumptions regarding the buffer system and the definitions of the components involved. The mathematical steps taken by participants are not fully resolved, leading to uncertainty in the final concentrations.

Ki-nana18
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Homework Statement


A 1.0-L buffer solution is 0.105 M in HNO2 and 0.180 M in NaNO3. Determine the concentrations of HNO2 and NaNO3 after addition of 1.8 g HCl.

Homework Equations


None


The Attempt at a Solution


I turned 1.8 g of HCl into mols and got 0.0494 mol of HCl. I subtracted this number from .105 M to find the new concentration of HNO2 and got 0.154 M. For NaNO3 I added 0.0494 and got 0.229 M but these answers were wrong. So what is the process to solve this problem?
 
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Technically speaking HNO2/NO3- mixture is not a buffer.
 


It's supposed to be NaNO2.
 


Ki-nana18 said:
got 0.0494 mol of HCl. I subtracted this number from .105 M (...) and got 0.154 M.

Check your math and pay more attention to what you add/subtract. Idea is - in general - OK, but the execution is horrible.
 


I got the right answers, thank you for your help. :approve:
 

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