Chemistry: A titration of ethylamine with HCl.

In summary, the task is to find the pH of a titration involving 50 mL of 0.150 M ethylamine and 0.100 M HCl. For part a), the pH is determined when 10 mL more HCl than required has been added. For part b), the pH is determined when 75% of the required acid has been added. Henderson-Hasselbalch equation and Ka value of 2.34*10^-4 may be used in solving the problem.
  • #1
sondawg
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Homework Statement


For the titration of 50 mL of 0.150 M ethylamine (C2H5NH2), with 0.100 M HCl, find the pH :
a) when 10 mL more of HCl has been added than is required
b) when 75% of the required acid has been added

Homework Equations


Maybe Henderson Hasselbalch?: pH = pKa + log (base/acid)
Ka = 2.34*10^-4

The Attempt at a Solution


I honestly do not know where to go with this.
 
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  • #2
I managed to solve most of the problem by now, just can't get the two parts still in the question.
 
  • #3

FAQ: Chemistry: A titration of ethylamine with HCl.

What is a titration in chemistry?

A titration is a technique used in chemistry to determine the concentration of a substance in a solution. It involves adding a known amount of one solution (the titrant) to another solution until a reaction is complete, at which point the concentration of the unknown solution can be calculated.

Why is titration used in the context of ethylamine and HCl?

Titration is used in this context to determine the concentration of ethylamine (the unknown solution) by reacting it with a known concentration of HCl. The reaction between ethylamine and HCl is a neutralization reaction, which means that all of the ethylamine will be consumed and the remaining HCl can be used to calculate the concentration of ethylamine.

What is the purpose of titrating ethylamine with HCl?

The purpose of titrating ethylamine with HCl is to determine the concentration of ethylamine. This information can be used in various applications, such as in the synthesis of pharmaceuticals or in understanding the properties of certain chemical reactions.

How is a titration of ethylamine with HCl performed?

To perform a titration of ethylamine with HCl, a known amount of HCl is added to a flask containing the ethylamine solution. The flask is then swirled to ensure thorough mixing, and the HCl is added gradually until the reaction is complete. The endpoint of the reaction is usually determined by using an indicator or by measuring the pH of the solution.

What factors can affect the accuracy of a titration of ethylamine with HCl?

Several factors can affect the accuracy of a titration of ethylamine with HCl, including the concentration and volume of the solutions used, the accuracy of the equipment used to measure them, and the skill and technique of the person performing the titration. It is important to control these factors as much as possible to obtain accurate results.

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