Neutralizing a basic reaction with HCl

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SUMMARY

The discussion focuses on the neutralization of a basic solution of sodium hydroxide (NaOH) using hydrochloric acid (HCl) in the synthesis of salicylic acid from methyl salicylate. It is established that the amount of HCl required for neutralization is directly based on the moles of NaOH present, specifically 120 mmoles of HCl for 120 mmoles of NaOH. The importance of stoichiometry in calculating the required acid is emphasized, alongside the consideration of whether the goal is merely neutralization or also protonation of salicylic acid. The necessity of calculating the amount of HCl before lab work is also highlighted.

PREREQUISITES
  • Understanding of stoichiometry in chemical reactions
  • Familiarity with acid-base neutralization reactions
  • Knowledge of salicylic acid synthesis from methyl salicylate
  • Experience with pH measurement techniques
NEXT STEPS
  • Study the stoichiometric calculations for acid-base reactions
  • Learn about the synthesis of salicylic acid from methyl salicylate
  • Research the use of pH probes in titration processes
  • Explore the implications of protonation in organic synthesis
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Chemistry students, organic chemists, and laboratory technicians involved in acid-base reactions and organic synthesis processes.

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Homework Statement


I am reacting methyl salicylate with sodium hydroxide to produce salicylic acid. However, first it is important to add acid to neutralize the very basic solution.

My question is, when determining the amount of HCl to add, do I need to take into consideration the methyl salicylate? Or am I just basing it off of the amount of sodium hydroxide I add?


Homework Equations





The Attempt at a Solution

 
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Can you simply add the HCl drop-wise until your pH probe or paper yields a neutral result?
 
No, I am supposed to calculate the number before coming to lab.
 
Think what reactions take place and what substances are present in the mix when you start adding acid. This is just a simple stoichiometry.

The only tricky part is whether you want to just neutralize, or to acidify to protonate salicylic acid. That depends on the procedure you are going to follow.
 
So if I am just trying to neutralize, and if I have 120 mmoles of NaOH, then I would need 120 mmoles of HCl to neutralize, right?
 
IFF you have 120 mmoles of NaOH - yes.
 
Is this any different to just starting with a saline solution? Perhaps with 2 or 3 drops of acid or alkali added to tilt the pH one way or the other?
 
First, you won't get pH high enough. Second, write reaction equation.
 

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